Professional Friend Requests

To accept or deny? I'm having a new etiquette issue of the 21st century. Recently I've gotten a few friend requests on facebook from people I know in the professional world. More specifically, a client of mine and his son. Now, my profession is such that we consult for our client related to development improvements (subdivisions, lot line adjustments, commercial/mixed use developments, local, state and federal agency interface etc) and we deal with things seemingly very important to our client: time, money and property. So, to have my clients on facebook puts me in a strange position. What if I did or said something on facebook that made me look unprofessional? Not that I make it a habit to express embarrassing or immoral behavior, but what if my actions in my personal electronic world had a detrimental affect on my professional world because of this weird online friendship? On the flip side of this, we live in Humboldt County, and I see these people in the real world outside of my work capacity all the time. Grocery store, musical events, even the bar. So, I think my conclusion is that I will accept them as friends, because what would it look like if I denied them? I think it could be more detrimental to our relationship than accepting them. I do have a current goal to watch what I say more often, so maybe this will be a test to my tactless blunt antics that have gotten me in trouble in the past. And maybe I'll stay off facebook a little more.