Anybody can claim they are from lulzec.

"Thank you for the love tonight. I know we quit, but we couldn't sit by with our wine watching this walnut-faced Murdoch clowning around."

https://twitter.com/#!/LulzSec/status/93103067662258176

False. Only those involved in LulzSec can post to the Twitter page.

Edit: Though, looking at the screenshots of the tweets on the TechCrunch page, they don't actually explicitly say it was them.

Edit 2: They did claim responsibility for it (just not in the tweets TechCrunch took a screenshot of).

You're making the mistake of thinking the twitter account is somehow "official." It is, again, just an "anybody" claiming to be in LulzSec

"Anybody" who has the password to the Lulzsec Twitter account. Or who, very unlikely, hacked Twitter.

It's official in the sense that lulzsecurity.com endorses it (and @LulzSec endorses lulzsecurty.com), so either both @LulzSec and lulzsecurity.com are 'fake' or they're both actually controlled by LulzSec.

I think it's pretty safe to say that they're both controlled by LulzSec.

Does it matter really? For all we know different people could have been posting stuff during the 50 days all under the same banner.

Sure, but can anybody post from Lulzsec's Twitter account?

Sabu was the leader/only person worth a damn of the bunch. The other kids he "teamed-up" with to make LulzSec have long since fled the group, but Sabu remains.