The past few conferences / training sessions I’ve done I’ve introduced this concept of social networking community platforms being stronger at some methods of interaction and (possibly) weaker at others.

Facebook is a referral community.
Twitter is an amplified community.
Pinterest is a visual community.
LinkedIn is a reputation community.
YouTube is an attention community.

Google+ is an Internet community.

I’ve worked in the digital media arena since 1997 and this is my professional opinion on the space via my 17 years of experience. Your experience may be different. That’s the beauty of the Internet.