Facebook loses 6 million users in US, 1.5 million in Canada

Overall, Facebook gained 13.9 million users in April, and 11.8 million users in May – compared to a typical month in 2010 where the company gained 20 million users per month on average.

A report published Monday morning on mashable.com says that if this slowing trend continues for two consecutive months, it could be a significant indicator for Facebook’s future.

Despite the slowed growth in North America, Facebook continues to dominate the social networking world, having reached 687 million active monthly users by the beginning of June 2011. The majority of new users are from countries that are late in adopting Facebook, such as India, Brazil, and Mexico.