I edit this old feature request of mine, in the hope that mentality have evolved and some consensus can be reached and some action be taken:
After each question on MO (with no answers yet), we can read: "Know someone who can answer? Share a link to this question via email, Google+, Twitter, or Facebook." I find this very problematic. Why should we encourage people to use one or several of those three platforms?
---- edit of August 8, 2018.
Since and while this message is still here, I stop every participation to MO (asking or answering questions), and I call everyone to do the same.