On Friday, MAC launched Shop Together, an interactive experience where you can shop the brand's website while chatting with your friends. Found on the lower righthand corner of MAC's site, all you have to do is log on through IM, email, Facebook, or Twitter, invite your pal(s), and instant message away. Will you be using this feature to get your buddies' opinions and to partake in some witty banter, or do you prefer to shop solo?