https://www.vice.com/en_us/article/y3wvwy/how-to-keep-up-with-subway-delays-now-that-twitter-is-broken

Last week, the Metropolitan Transportation Authority, which runs the New York City subways, buses, and commuter rails, announced it will no longer be tweeting service updates because Twitter is too unreliable now. Yes, Elon Musk, the man who started several companies out of disdain for public transportation as a concept, made Twitter too unreliable for even the New York City subway. Other transit agencies are considering doing the same. 

Twitter updates were a useful but limited tool in the arsenal of subway navigation services. The same information the MTA posted to Twitter would also be posted to its website and APIs third party apps can display. The Twitter alerts were most useful for providing a clear timeline of events, seeing how long ago a service alert was issued, what updates have been provided, and what residual delays there may be after a problem is resolved and the service alert disappears.