I think my issue is that the introduction of an idea on Facebook happens among people who chose to be connected to you. More than likely those people know what you are like or they have an idea of who you are, so sharing info becomes redundant and accomplishes very little. It does get the message out, but only in a temporary fashion. More important only "trigger" or "controversial" topics gain enough interaction to keep a Facebook post relevant for longer than five minutes.
For example, I posted a comment that said I didn't want to get any inboxes about anymore shootings. That post generated over ten hours of interaction. I shared a great video about a change in discipline at a school that decreased suspensions and the interaction was with you Cynique and about 5 other people.
I think that's the problem. People are very selective about what they deem interesting and important and very often the only thing that will have legs on Facebook is something that is overtly emotional. Social Media has its value, and like anything there are always going to be positives and negatives.