I’ve seen that posting about any point that is owned by either “the left” or “the right” is only going to bum people out and risk pigeon-holing (“holing” how does one “hole”?) the person posting it. Nobody’s opinion is going to be changed about anything. Any time I vote, sign a petition, or send a letter to my Congressman, I imagine how many posts I’ve seen from people that do neither and then I just sit back and enjoy the math on that.
I think there’s also the risk of revealing more about ourselves than we care to when we post about some of these polarizing topics. When I see a friend express anger on a certain issue while completely neglecting to show any concern on another, I’m assuming I’m the only non-psychiatrist /non-sociologist / non-genius that can piece together what that means. Posts don’t exist in a vacuum – context is matters.