This seems to be endemic on 'other' social media, as soon as something happens or a particular website goes down people or there is a problem 'take to social media' I guess it is a way for them to make themselves heard, people don't seem capable of normal face to face or verbal communication.
Sadly it is also the ONLY way to get attention of people, esp companies who you can't get through to customer service or support, so perhaps this thinking is applied to people they are with too.
Of course what people don't realise is doing so just puts your opinion in to the ether as people are under some dillusion that others actually CARE about their situation.
perhaps when YOU are living with someone, and they are treating YOU badly and YOU are the one paying the rent or bills why should you leave.