David is a user on mstdn.io. You can follow them or interact with them if you have an account anywhere in the fediverse.
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Since everyone is asking, I'll answer here and hope people can see this:
- Node colors mean communities found with the modularity measure (e.g. blue instances are mostly japanese ones)
- Node sizes mean number of connections, not number of users
LB: heeey 
@fdavidcl it's impressive.😱 u did a good work! 
@fdavidcl are you sharing your code/tool for building this?
@alphakamp The tool for the visualization is Gephi https://gephi.org/. I will probably share the script to obtain the data, when I finish the analysis
That said, as others have noted, fediverse, not mastoverse 😛 I run pleroma
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