Yes, it's my primary after getting rid of Facecrook, Shitter, Instasham and Crapchat back in 2018, and Poosky and Pisscord this year.
Yes, Mastodon, and other Fedi platforms like pixelfed (npub1gq5…qcul), PieFed, loops (npub1wa2…zalq) and Misskey totally work for me.