This post nearly had me going - InfoWorld put up an "MS and Yahoo agree to terms" post, and the first half of the first page was believable - it wasn't until I got to the XBox and Zune give-away line, followed by "Google buys Facebook" thing, that it was clear that it was a prank post. Of course, it should have been clear from the get go - I mean, just look at the InfoWorld url :)
The basic premise - such a deal being consummated - is entirely believable. Here's what I wonder: how many people who barely read past the Techmeme headline will get taken in by this?