Have we reached the Facebook saturation point?

That’s one possibility suggested by monthly growth data from Inside Facebook, which reports that Facebook gained only 320,000 new U.S. users in June after a blockbuster gain in May of more than 7.8 million. Moreover, the net’s dominant social networking site lost active users in the 18-25, 26-34 and 35-44 demographic ranges, while gaining users in their mid-teens and middle years.

One possibility is that the May and June controversies over Facebook’s privacy policies and dominance have kept the company from tremendous new growth and even led some to curtail their use. Another possibility is that it’s just a statistical aberration, or a result of changes to the advertising system, where Inside Facebook says it gleans its numbers.