Marissa Mayer has been at the helm of Yahoo! for just over a year, and in those fleeting twelve months, has purchased 18 companies. Today, AllThingsD reports it becomes 19, and we still don't really know why.

The newest inexplicable acquisition is Lexity, an online shopping analytics firm for small businesses. Yahoo! doesn't really "sell" anything, in the traditional sense of the word, or even a non-traditional sense of the word, so this is puzzling. Will Tumblr start an apparel shop? [via AllThingsD]