But it raises the question: why are U.S. users ditching Facebook? Here's a look at 5 possible explanations for May 2011's Great Facebook Exodus.
#1 - Nobody's Leaving -- The Data is Wrong
If you ask Facebook, this is one of those instances in which there's smoke, but no fire. that reports such as Inside Facebook's "use data extracted from our advertising tool, which provides broad estimates on the reach of Facebook ads and isn't designed to be a source for tracking the overall growth of Facebook."
So Inside Facebook ran using third-party measurement services like comScore, Compete, Quantcast and Google Ad Planner, and that data is totally schizophrenic. Some show fast gains, others show slow gains, others report losses, and oddly, Sony's ranking system shows . (Just kidding.)
#2 - The Privacy Issues Keep Getting Worse