Okay, seriously, Anonymous isn't a hacktivist group.
There are members of Anonymous who are involved in hacktivist activities.
There are also members of Anonymous who are complete dickholes.
Next, there was no hacking of Facebook. Someone got an invite. Girl allowed people she invited to invite other people.
Girl invited someone who decided to start inviting a shitton of other people, and it went viral because someone probably posted about it on /b/ and /soc/. Considering how butthurt the girl got, and how police got involved, I'm sure many lulz were had. And considering it happened again, I'm sure even more lulz were had.
This is her fault for being stupid and not taking advantage of Facebook's privacy settings. If you can't take a joke, get off the internet. Srs bsns indeed.
Also, I suck for breaking rules 1 and 2, but whatever.