So if someone asks, Can you add me on FB? Would you reply?: No, I have a no current coworkers policy. Is there a way to do this without hurting people's feelings?
What you wrote is pretty good. To wrap it up, you can offer an alternative, like "let's do LinkedIn instead" so they know it's not just them you say no to and that you are actually interested in connecting with them not just blowing them off.
When I was a TA, I'd have students constantly try to add me on Facebook. The conversation would go nearly exactly like you'd describe:
> Are you on Facebook? Is this your profile?
> Yes, but I'm not gonna accept your friend request.
The reply was usually a bit snarky with a bit of a chuckle, and that did it for most college-aged people. The few times someone persisted, I explained that Facebook is an aspect of my social life, not my professional life, and I intended to keep it that way.
I was in this situation many times and I have always replied with "sorry, I keep my facebook friends only to the closest group of friends and family". Never had any negative reaction to it(apart from my friend's crazy ex who decided he should absolutely break up all contact with me immediately and never talk to me again because I refused to accept her invitation literally within 5 minutes of receiving it).
I also frequently go through the list of my friends and remove everyone I haven't spoken to in a while, keeping my friends well below 100.
So if someone asks, Can you add me on FB? Would you reply?: No, I have a no current coworkers policy. Is there a way to do this without hurting people's feelings?