I think sites such as Twitter and Facebook have grown overconfident. Politics are very much like a pendulum - we're in a situation where it is very much leaning to the furthest side of the 'Left' in recent years. Naturally the 'Far Left' isn't a particularly good place for any society to be, thus momentum is slowly pushing it towards the 'Right'.
Unfortunately the 'Far Right' isn't a good place to be either but given the very nature of politics we typically end up with extremes by their very nature. Very few politicians - or their supporters - seek to compromise. Thus we are unlikely to see anything 'moderate' or balanced.
Ironically Twitter and Facebook are shameless opportunists. If there is a shift towards the 'Far Right' then you can bet that they will support such an endeavor because they want to make money and exploit public support. They're learning that shunning the 'Right' isn't a smart move when there's a lot of people out there who adhere to the 'Right' itself.
...and I am in the middle myself. I loathe the obsession with the 'Left' and the 'Right' due to liking policies on both sides depending on the individual subject. Though finding a balance is, unfortunately, very difficult.