Would you give away your best client's personal contact information to a spammer or identity thief? If you are not actively protecting your client and personal contact lists on social media sites, you may be doing exactly that.
A couple of days ago, I used Facebook to ask a friend to give me a call. I included my office phone number. Later in the day, I received a note from another Facebook friend who must have seen the note on my Facebook Wall. My friend warned me: "Don't ever post your phone number on your wall. You'll get inundated with marketing calls."