I have stopped contributing to the SE network. Interesting questions have become too few and far between in the ever growing sea of garbage.
I regret to see that, over the past two years, math.stackexchange has been devolving into another Quora or Yahoo Answers. With the latest changes in moderation policy, encouraging low quality questions and answers, and harshly punishing attempts to clean them up, I have given up the fight.
It was nice while it lasted. Goodbye.