I use a lot of social media (facebook and Google + primarily), but I find these two articles to be relevant reviews of unspoken rules and practices with social media interactions.
7 Unwritten Rules Of Social Media
There's a bunch to consider, folks. It's like I try to teach my students (same as others do): Once it's there, it's there. We leave impressions of ourselves all over the Internet. The best thing we can do is try to keep it all positive and not detract from how we want to be perceived. But I agree with much of what's written here.
What do I think the most important lesson is here? I think it's what I'll call the "Jerry Rule." You see, when my wife and I were first married, we went to church with a guy named Jerry. Jerry never heard a question he couldn't answer. As a matter of fact, no one even tried to participate in the discussions in Sunday School, because Jerry would answer every question and never shut up.
Online is the same. Just because you post a lot of content doesn't mean it's good content or that everyone is excited to hear what you're saying.
As with any technology integrated, just be smart, ok?