Analysing #ClimateChange and Related Hashtags on Mastodon

While Mastodon is still a relatively new platform (especially compared to other platform like Twitter) it is filled with a thriving community of people who love to share their knowledge and express their options.

I thought I would take a closer look at a topic which always appears to be part of a conversation somewhere. This topic is climate change, or, in social media terms, .

Why in particular? It’s always an active topic and people are likely to share an opinion. Plus, I find it interesting.

Given its widespread coverage, I thought I would explore this further and uncover other hashtags which are relevant and used to support the conversation in some way or another.

In a separate blog post, I covered the basics for building what I call User-Hashtag co-occurrence networks. The basic idea is that a network is formed of two types of nodes – users and hashtags. Edges are formed where a user features as hashtag in their post.

Using this technique, I thought I would use as an exemplar to see if we can extract anything interesting out of the network. The network was built from activity within the past 5 days across Mastodon.

The resulting network featured a total of 458 users, 1,373 hashtags, 4,960 connections (edges) and 885 posts.

That’s quite big so to make things a little more manageable I only took the top 25 hashtags based upon the number of connections (degree). These hashtags are as follows along with the reduced network.

Hashtag Count
#climate 251
#environment 186
#ecology 132
#pollution 126
#climatecatastrophe 121
#nature 38
#globalwarming 36
#science 34
#climatejustice 31
#fossilfuels 30
#us 27
#news 26
#climateaction 22
#sustainability 21
#politics 21
#biodiversity 20
#photography 19
#emissions 17
#fossilfuel 16
A bipartite User-Hashtag networks of the top 25 hashtags (yellow) and the users (blue) which promoted them.

Overall, the results aren’t as interesting as I thought. One thing I found fairly interesting was how country hashtags (e.g. , , ) were featured. This suggests that people are are discussing climate change with respect to a country in mind. Discuss policies? Also, it’s interesting how terms like and rank quite highly as part of the discussion.