Ask HN: Is it surprising that people participate in social media?

I find it very difficult to relate to anyone participating actively in social media. Usually by the time I have formed a statement that expresses a point I want to make, I have convinced myself it's not worth saying.

Do others share this natural inclination? Have you ever overcome this? What motivates you to post opinions or respond at all, if you do? Is this a minority point of view, or is this a result of self defined sampling bias? Has anybody studied this?