Facebook vs criminals 1-1?

BACK FROM VACATION!
And what do I find? Social media is making news again. I saw an article about how Facebook prevents criminal justice. People use social media to identify criminals, which leads to their witness being questioned.
But it’s not all bad, sometimes it can help the police track down criminals to0, as the article also mentions.

And then we have the case where it just gets sad. This news reports that earlier this week, two teenage schoolgirls got taken to court for bugging the teachers staff room. How they got caught? One of them bragged about it on her Facebook-page.