Yahoo! UK is about to start selling ads on it IM service. The first advertiser on the Messenger will be fashion brand FCUK which will allow users to customize the IM avatars with its latest collections. Quoted on Brand Republic, Darren Cairns, head of marketing for Yahoo! Messenger, explained this is an excellent marketing opportunity to target the "i-generation" (???) of 16 to 34 years old Internet users.