As one of the main Mastodon developers, I can't promise you that Mastodon will be a complete and exact Twitter replacement for you, but it may fit your use-cases, at least it does for me.
Just keep in mind that it is not exactly the same thing, some core design decisions are different (there isn't an unique centrally-governed website, but many interconnected servers operated by different individuals and organizations) and thus the tradeoffs can be different as well.
While I personally don't think Mastodon should aim at being an exact replacement to Twitter, I do hope Mastodon can be useful to more people wanting an alternative to Twitter! And I know there are lots of room for improvement, on things we do know, and on things we don't.
Also keep in mind that Mastodon is developed by only two core developers payed through a non-profit funded through sponsorship, grants and donations, so please be patient!
Since there’s a lot of new people trying out Mastodon, something to be cautious about: your DMs can be read by admins of your instance and the instance of the recipient, and when your toots cross an instance boundary, it’s possible for your private toots to get boosted. Some of the privacy guards in place on platforms you’ve used before don’t work the same here.
Hæ @naglalakk!! Loksins mætt!!
Það var eitt rigningarkvöldið að bankað á útihurðina og þar stóð sjálfur Herbert Guðmundsson, frekar framlágur að selja geisladiska. Ég bauð honum inn í kaffi og spjall á meðan það var að renna af honum. Það kom fram að ég hafði aldrei séð hann „live“ í den og greip hann þá heimilisgítarinn, hóf upp raustina og byrjaði „There´s a way every day.... Can´t walk away“. Ég söng bara með og þetta var mjög skemmtilegt. Nánast með frægum. Hver ætli banki í kvöld?
Geymi forritið upp í hillu.