Earlier quoted context omitted.
If you dont mind, could you share an example of information posted exclusively on twitter which was crucial to you? Just curious;)
Paris' subway and local train lines each have a Twitter account, and they are the only reliable source of information regarding outages. Phone apps (at least three official ones with different data sources!) and websites can be outdated. Displays in station too (though less often), have outages of their own, and (rarely) even incorrect updates.
I personally do not know anyone in real life with a twitter account (although I have one, I have not used it in over 15 years), I wonder how many people just go without this information and are angry that it's (seemingly) not available.