And your name is masked on the seller's FB page. Only you and the seller can see it.
And if you are bidding in an auction,only you and the seller can see your ID.
Feedback is voluntary, btw. You don't have to leave it at all. Only about 40% of transactions get any FB from either buyer or seller.
If you think someone is checking up on your purchases or sales:
- Don't tell anyone your ID.
- Don't tell anyone your password
- Always log out when you finish your session
- Don't use 'remember my password'
- Don't leave feedback.