[Gab.com](http://Gab.com) (an alt-right social network) has migrated to Mastodon and is now the biggest server if you go by number of registered accounts (not a very reliable metric). The creator of Mastodon and many of the existing servers are ideologically opposed to gab so its interesting to see them respond to this move. It's not a direct threat to existing communities because they can block the gab server, effectively isolating it, but the associate is still unpleasant. In a decentralized setting isolating a malevolent community seems to be the main option. In many ways its better than a ban from a centralized company. A ban from twitter can be harnessed as a marketing campaign and paint the banned group as a rebellious underdog defending free speech. At the same time, on a decentralized network communities like gab will always have the infrastructure they need. Possibly in the future we can develop more sophisticated tools than a blanked ban of a large and nebulous community. Not all users and content on Gab is malicious and there is always space for constructive conversation that can potentially prevent some users getting radicalized. I think developing better systems for what gains traction on these kinds of networks is an essential task. I was disappointed to see that the Mastodon UI is just a twitter clone. I think there is an opportunity for better dynamics there that isn't being taken advantage of.