Robertson, a three-term mayor who first elected in 2008, said in a Facebook post that he is stepping aside to. and working on solutions to getting people off the. Several groups on Facebook rail against. Only post on password-protected sites. Leave out names. Yes to Flickr, no to YouTube. And for heaven’s sake, no bathtub photos. Parents are grappling with what is safe, and what fears are irrational. "Facebook need…