Took time out to read the ‘Pin Etiquette' page of that now famous social networking site, Pinterest.
The part that struck me as the most honest thing I’ve read in a while is this one entitled “Be Authentic” -
"Pinterest is an expression of who you are. We think being authentic to who you are is more important than getting lots of followers. Being authentic will make Pinterest a better place long-term."
Should apply to every social networking site, I think.