People get so upset when a free online service wants to make money off of freely submitted data. Gee. Who woulda thunk it? Maybe the question is really: Are there ANY on line services that are required for Life, Liberty, and the pursuit or happiness?
As for "social network" anonymity: There was a time people social networked by going to churches, clubs, and various events IN PERSON. Security? There was once a group of individuals who dedicated their fortunes, life, liberty and sacred honor to found a new nation. You can read their signatures on the Declaration of Independence.