As you are probably aware Mark Zuckerberg - founder of Facebook - recently said that privacy is no longer a social norm. Maybe or maybe not since one of the most popular articles from the NY Times is "The 3 Facebook Settings Every User Should Know". Yes, you can determine:
1. Who can see the things you share
2. Who can see your personal info
3. What Google can see - keep your info off the search engines
So if you do care about your privacy, be proactive and check out your settings.
Ernster, the Virtual Library Cat
Above the Law - A Legal Tabloid - News, Gossip, and Colorful Commentary on Law Firms and the Legal Profession