I'm running out of idea. Its about a problem I'm facing in Facebook. When I tried to reply to a comment, it said "Unable to post comment. Try later". I tried logging out and log in again, clear cache and restart but no avail. Same problem when I tried posting using iphone, another PC or switch browser. I have posted to Facebook and haven't heard from them for 3 days. BTW, I'm using Mac. What can i do?