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A short academic lecture on five key issues with social media. These include: misinformation, echo chambers and polarisation, binge scrolling, mental health and attention span
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0:04
Hello, I'm Professor Imagigen Smith and
0:07
welcome to my short lecture today on the
0:09
five most common negative effects of
0:11
social media. So, let's start by laying
0:14
the groundwork. Social media has become
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central to how people communicate,
0:19
access information, and spend their
0:21
time. While it offers clear benefits,
0:24
there is growing evidence that its
0:26
design and patterns of use can lead to
0:28
significant negative effects. In this
0:31
lecture today, I'll focus on five of the
0:33
most common, which are misinformation,
0:36
echo chambers, and polarization. Binge
0:39
scrolling, mental health, and attention
0:41
span. The bottom line of today's lecture
0:44
is social media is not simply a neutral
0:46
tool. It actively shapes how people
0:48
think, feel, and behave through
0:51
algorithmic design and repeated exposure
0:53
to certain types of content. So, let's
0:56
begin with the first issue, which is
0:58
misinformation. Misinformation refers to
1:01
false or misleading information that
1:04
spreads rapidly online, often without
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users realizing it is inaccurate. Recent
1:09
research shows that emotionally engaging
1:12
content is more likely to be shared,
1:14
regardless of its accuracy. As a result,
1:17
misinformation can influence public
1:20
opinion, health decisions, and political
1:23
attitudes. Let's unpack that idea a bit
1:26
more. Basically, social media platforms
1:30
prioritize content that generates
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engagement, such as clicks, shares, and
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comments. This creates an environment
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where sensational or emotionally charged
1:40
information is amplified. A 2024 report
1:44
by the WH highlights how misinformation
1:48
during health crisis can reduce trust in
1:51
institutions and lead to harmful
1:53
behaviors. For example, some people
1:56
spread and believed rumors that COVID 19
1:59
was a government conspiracy. Are we all
2:02
on the same page? I see some blank
2:05
faces.
2:07
So the issue then is not just the
2:10
presence of misinformation but how
2:12
easily it spreads and how difficult it
2:14
is for us as users to distinguish it
2:17
from credible factual sources. Okay,
2:20
moving on to the second issue, echo
2:22
chambers and polarization. An echo
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chamber is a digital or social
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environment in which individuals are
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repeatedly exposed to information,
2:31
opinions, and beliefs that reflect and
2:34
reinforce their existing views. This
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occurs because both algorithms and user
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choices filter out opposing
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perspectives, meaning that alternative
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viewpoints are either limited or
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completely absent. Polarization in turn
2:51
develops from this environment. It
2:53
refers to the process by which opinions
2:56
and attitudes become more extreme and
2:58
more divided over time. Rather than
3:02
simply holding different views,
3:04
individuals or groups begin to move
3:06
further apart, often adopting stronger
3:09
and more rigid positions. This can lead
3:12
to an us versus them mindset where
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opposing perspectives are not only
3:16
disagreed with, but also dismissed or
3:19
viewed negatively.
3:21
Let me paint you a different picture to
3:23
help understand these concepts. Imagine
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two users receiving completely different
3:28
versions of the same event based on
3:30
their past online behavior. Over time,
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this reduces exposure to alternative
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viewpoints and strengthens division
3:39
between groups. This is food for thought
3:42
because it highlights how social media
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does not just reflect opinions but can
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actively shape and deepen divisions in
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public discourse.
3:52
Okay, that leads me to my next part
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which focuses on binge scrolling
3:56
addiction. This refers to the compulsive
3:58
and prolonged consumption of social
4:00
media content especially short form
4:03
videos. Platforms are designed with
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features such as infinite scrolling and
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personalized recommendations which
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encourage continuous use. This is a good
4:13
rule of thumb. The more seamless and
4:15
rewarding the experience, the harder it
4:17
becomes to stop. Research shows that
4:20
short form content can activate the
4:22
brain's reward systems with dopamine
4:25
released in response to pleasurable or
4:27
engaging content and serotonin
4:30
influencing mood and perceptions of
4:32
social acceptance. both of which help
4:34
reinforce repeated engagement. I'd like
4:37
to throw this question out to the room.
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So, how often do you intend to scroll
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for a few minutes but end up spending
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much longer?
4:46
This then illustrates how design
4:48
influences behavior. The most important
4:51
thing to note is that it is not just the
4:53
content itself, but the anticipation of
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the next piece of content that drives
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continued use. Okay, moving right along.
5:02
The fourth issue is the impact on mental
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health. This includes increased levels
5:06
of anxiety, depression, and low
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self-esteem. A 2025 report from the
5:13
American Psychological Association links
5:16
heavy social media use with poorer
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mental health outcomes, particularly
5:21
among younger users.
5:24
Let's break that down. Social media
5:26
often presents idealized versions of
5:29
reality, leading to constant social
5:31
comparison. Users may feel they do not
5:34
measure up to others achievements,
5:36
lifestyles, or appearance. I'm going to
5:38
go off on a tangent for a moment, but
5:40
it's related. Think about how often
5:43
people compare themselves to what they
5:44
see online, even when they know it is
5:47
unrealistic. This repeated comparison
5:49
can have a cumulative negative effect on
5:51
well-being. Sadly, in some regards, it's
5:54
a double-edged sword because while
5:57
social media can provide connection and
6:00
support, it can also increase feelings
6:02
of inadequacy and isolation. The final
6:05
issue is reduced attention span. This
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refers to the decreasing ability to
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focus on tasks for extended periods,
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particularly those that require deep
6:15
concentration.
6:17
Short form content, which is fast-paced
6:19
and highly stimulating, trains the brain
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to expect constant novelty. Research
6:25
from 2024 indicates that frequent
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consumption of short videos is
6:31
associated with difficulties in
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sustaining attention and increased
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distractability.
6:37
You'll want to get to grips with this
6:39
concept as it has important implications
6:41
for learning and productivity. For the
6:44
sake of time, I'll skip over this in
6:46
detail, but the key point is that
6:48
constant exposure to rapid, fragmented
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content can make it harder to engage in
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slower, more demanding tasks such
6:56
engaging in deep, focused thinking. So
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to wrap this up, we have explored five
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major negative effects of social media.
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Of course, these are not isolated
7:07
problems. They are interconnected and
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often reinforce each other. The
7:12
take-home message here is social media
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use needs to be more conscious and
7:16
critical. Understanding how these
7:18
platforms operate allows users to make
7:21
more informed choices about how they
7:23
engage with content. Just before I go,
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I'd like to leave you with a final
7:28
thought that social media does not just
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influence what you see. It influences
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how you think and feel.
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Recognizing this is the first step
7:39
towards using it in a way that supports
7:42
rather than undermines your own
7:44
well-being.
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