Twitter used to be extremely unreliable, and in fact back on the late noughties this was commonly seen as a reason that Twitter was doomed and would be replaced by other microblogging platforms (there was precedent; a number of early social media sites had already died essentially due to unreliability).

Eventually, it became fairly rock solid, and has stayed like that since. A reversion to "oh, yeah, essential features are down for hours, that's just Twitter being Twitter" definitely feels like going back to the noughties.