4. Amazon (AMZN) and Facebook: Amazon's not decking its "O" with a lighted wreath, and there aren't elf hats on people's Facebook avatars, but a deal announced between the two companies this week could take a lot of the guesswork out of shopping for friends and acquaintances. The deal makes friends' wish lists available for viewing once the accounts are connected and makes product recommendations based on information in their Facebook profiles. While Amazon kept Facebook's "Like" button off its detail pages, friends' product reviews will become more easily accessible. Start wailing about privacy all you want, but your mother who has no idea what you like anymore and your friends who've run out of gag gifts just got a little help this holiday season -- no thanks to you. Ingrate.