my favourite use of "exponential" meaning "very quickly" is the article i read recently that said "there's an exponential increase: the number grows quadratically"
i mean, there's even a non-trivial exponent involved in quadratic growth, what more do you want?!
Mastodon is a server for a federated social network: everyone can run a server if they want to, including me. So this is a Mastodon server for me (Vierkantor) and my friends.