14 June 2011 Last updated at 11:39 GMT
Facebook has denied that it is losing customers, saying it is "pleased" with growth.
Figures from Faceboook monitoring site Inside Facebooksuggested that during May, Facebook lost six million users in the US and 100,000 in the UK.
But the social network, which does not usually comment on third party statistics, questioned how it arrived at this figure.
Other net measurement firms said they had seen growth over the same period.
"From time to time, we see stories about Facebook losing users in some regions. Some of these reports 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," the firm said in a statement.
"We are very pleased with our growth and with the way people are engaged with Facebook. More than 50% of our active users log on to Facebook in any given day," it added.
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