From a quick look the facebook app comes off as intrusive which is a bit different for a YC company, you can't even look at it without giving them access to your email address, then while clicking through products it will pop-up with refer a friend and post to wall.
There are quiet a few of these sites around now that give you a small list of deals and presumably buy these items in bulk. Unless all the products are in a niche it would be pretty rare that much that I wanted would crop up, other people could be different I suppose.
I had the same thought too. Their deal structure seems a bit convoluted, and when this is paired with the fact that they are gleaning my personal information it comes off as spammy.
There are quiet a few of these sites around now that give you a small list of deals and presumably buy these items in bulk. Unless all the products are in a niche it would be pretty rare that much that I wanted would crop up, other people could be different I suppose.