"As for Facebook and Google+, I reject them on principle because they require people to give their 'real names'. I am proud to identify myself when stating my views; I can afford to do that because I am in a fairly safe position. There are people who rationally fear reprisals (from employers, gangsters, bullies, or the state) if they state their views. For their sake, let's reject any social networking site which insists on being told a user's real name... Google+ says it will offer to hide the user's real name, but demands people prove an 'established identity' or provide ID. I am suspicious of this requirement, but not sure what it will mean in practice..."
"People sometimes ask me to recommend an email service. The two ethical issues for an email service are (1) whether you can use it without running any nonfree software (including nonfree Javascript code from the site), and (2) whether it respects your privacy... Last I heard, Gmail was satisfactory on issue 1, and probably so are many others. On issue 2, I have no way to verify that any email service is satisfactory. Therefore, I have no recommendation to offer... However, I can suggest that it may be wise to use an email service that is not connected with your search engine. That way you can be almost sure that your email contents don't influence your search results. You shouldn't identify yourself to your search engine in any case."