Favorite Online Communication Vehicle?

Greetings colleagues! I just posted two HITS and thus am now feeling bold enough to post another TARGET. How do you find and converse with peers online? We have many choices today: Facebook (huge for me because of my many professional contacts), Twitter (I follow some very smart people), Nings, and of course the venerable listserv/message boards. Which to you use and which do you prefer? That is my question in the short survey I just posed. I am hoping for responses. Beyond demographics, there are just two questions and a comment box if you should choose to say a little bit more.

Here is the URL for this survey: https://www.surveymonkey.com/s/onlinecomm

As always, thanks in advance and have a great week! Cheers, mabell