Situation:
You know someone online, in a forum. Much like Mumsnet. You've sent PMs a few times recently but not so much.
You found out she was the one who messaged you on eBay asking for a particular item. She lives overseas so you told that buyer that you don't ship overseas because of all these dangers to the seller (e.g. if the buyer claims it's not as described, eBay usually sides with the buyer, so you're going to pay the return fee on top of refunding the original fee, which is a substantial amount, etc)
But then you found out this person you know from a certain forum (and who seems nice and reputable) was the one who messaged you.
Would you sell to her?
Would you tell her that you're X from Y forum?