Mastodon has recently enabled Activity Streams 2.0 (I'm fairly certain 2.0) which is a W3C Standard. I believe the move was founded on arguments of "OStatus is

Mastodon has recently enabled Activity Streams 2.0 (I'm fairly certain 2.0) which is a W3C Standard. I believe the move was founded on arguments of "OStatus is a tad unflexible for our needs" or something along those lines.