Anecdotally, I could have told you that Facebook was on its way out — teens are other young folks are moving away from it, choosing to stick with texting, Tumblr, or Twitter. But now Facebook itself admits it’s a problem.

That’s the thing about being a public company: You have to acknowledge your warts. In its annual 10K filing, the company wrote:

We believe that some of our users, particularly our younger users, are aware of and actively engaging with other products and services similar to, or a substitute for, Facebook.

But what about those 800 gadzillion users (or whatever the number is)? Well, “users” doesn’t mean they actually use Facebook — just that they have an account. Or more than one. (Thanks to my son’s Farmville obsession, I have five.)

And a new study from the Pew Internet & American Life Project — an organization that I’ve always loved — “Coming and Going on Facebook” found that a lot of folks are taking a “break” from Facebook, and that “One in five online adults (20%) say that they used Facebook in the past but no longer do so.” (But they’re still counted as users.)

Something to keep in mind.

Click here to read the Salon article, “Is Facebook over?

And here for the Pew report.