Yes, I've seen providers private life public pages on facebook.  The best course of action is to leave it be.  None of us would like them to post, "Hey thanks for the $300 you really fucked the shit out of me - got your money's worth, huh?"  I say keep a clear and broad line of demarcation unless you are specifically asked to cross it and in that case the choice is yours.

In short....leave them alone and let them live their lives.

We purchase time. That's all. Nothing more...nothing less. We don't purchase, or are entitled to, any aspect of their life other than time spent.
Sure...once in a while we stumble upon something...or see them in public. Shit happens and it's a small world after all.

Ever notice how you NEVER see a question like this posed by a provider? There's a reason.
They have class, discretion, and no inherent need to tell the world what they know or have discovered.

At the end of the day....be a man. Don't be "that guy".
Simple.

Several years ago an agency lady that I had been seeing regularly and become quite friendly with informed me that she was going to be taking a short break from escorting to deal with some personal issues.  On the last night we met she wrote down her real name and her phone number on a note pad, gave it to me and told me that I could feel free to check in with her and see how she was doing.  We talked and texted a few times over the next several months but one day she stopped returning my calls.  I tried a couple of times to text her but when she didn't respond I took the hint and figured out that she had decided to move on from escorting and, like it or not, that meant moving on from her "escorting" friends.

Fast forward to about a year ago.  I found her on face book one night when I was surfing the site just seeing who was on there that I knew.  As much as I would love to catch up with this very sweet lady I would never try to contact her through facebook or any other means at this point.

If you truly enjoyed the time you spent with a lady in the past the best way to can show your appreciation is to respect her privacy now and in the future.

I came across a provider on facebook and we had a mutual friend I didn't realize we had. I did friend her on facebook and she accepted and we've exchanged a couple of e-mails since then. I think it really depends. Most of the time I would never consider adding a provider on facebook. But we were in similar social circles and our mutual friend happened to be one of my closest friends. So it wasn't too awkward but it was important to be very careful as it very well could have been if you aren't discreet. In general, I'd recommend leaving her alone, but if you do decide to send her a friend request the worst that would likely happen is she denies your request.

send her a message once, if no response, leave her alone!

If you really want to try it, do not hesitate. Otherwise you will always feel a lingering tendency on your heart. Message her once, and if you do not hear from her, or her reply is something like "do not contact me ever", then leave her alone.

The fact that you chanced upon your buddy friend's friend list and saw her is just that, chance. And whether she responds to you in affirmative is also a chance. If she feels she can take the risk/leap and had good memories with you, she will respond otherwise its best to leave these things to instinct, intuition, timing instead of analyzing it, discussing it, debating it and brooding over it.

GO with the flow, do what feels right (you have to be sane of course), do not go by any other's protocols or "advice", be your own man.

LG