A thing I am really liking about #Mastodon so far is that it hasn't yet collapsed into very isolated language groups.
For example, here I routinely see at least English and French, and have started seeing a bit of Japanese around too.
On the bird site all I see is English, with the occasional Japanese retweet because I have a friend who works translating Japanese games to English so she sometimes retweets Japanese people about those.
I understand almost no French but it is still good to see.