Wow, stack overflow actually makes more logical sense than Facebook based on the building blocks you mentioned for stack overflow.
I find Facebook’s website alienates me and occasionly rubs me the wrong way with their creepy privacy policies and such and trying to get people to over share.
An interesting proposition. Social media is here to stay and most humans are social to various degrees. Some of the media by which we interact (such as sending texts) do not provide for social interaction in the human contact sense. If software could be developed to promote more real social interaction it would be valuable