I've joined a French microblog community called SeenThis with an active community of bloggers who share interesting articles. It's on quite a high level. Unlike my French. But it does include a translation engine for when I get stuck, and I'm strictly trawling, rather than actively participating.
Facebook's censorship and information sharing policies reveal a persistent pro-Israeli bias.
Just caught up with the Guardian post of Hossein Derakhshan, "Iran's blogfather: Facebook, Instagram and Twitter are killing the web", from December last year.
I deactivated my personal Twitter account two or three weeks ago because I did not like the direction the company seems to be moving in.
The Wall Street Journal has an article "Report: 44% of Twitter Accounts Have Never Sent a Tweet" whose comment stream is particularly vile, though some of the remarks are valid.
Note: this posting is still a work in progress I'm tired of the multiple services through which we connect to people, and tired too of closed garden monopolies like facebook.