Digg, the user-generated news site, may be close to being sold off to the highest bidder. According to TechCrunch, a source very close to the alleged deal, four companies are interested in buying Digg, including Microsoft and Google. Remember the face-off (ahem) between the two giants over Facebook? We could be set to see a similar battle -- that is, if the other two "media/news companies" aren't successful.