I wasn’t really involved with social media back then sadly, but yes I did get that general impression. Before all the toxicity really overtook it around 2020 it did seem quite pleasant.
Shame really, corporate greed taking something quite nice and milking it so hard it’s absolutely ruined. Then again, it gives way to things like bluesky so i guess it has its upsides!
I know KDE has a calendar, not sure how well it’d work for your use case but it’s there!