Facebook had fewer unique U.S. visitors in June 2012 than it did in June 2011 by comScore’s reconing. This is the first time that the world’s dominant social network has experienced a year-over-year decline.

While this could be due to comScore revising the way it compiles its numbers, it at least shows that growth in the U.S. has slowed. It’s worrisome for the company from a business perspective, as fewer people accessing it via desktop means fewer ad dollars

Read the full story on MediaPost.

SHOUT.  Join the dialogue and get the latest news updates .  Follow [a]list daily on Twitter.