"I guarantee that they were irritated," Marcus said.

For its part, today Twitter co-found Biz Stone acknowledged that the micro-blogging site had not restored full service, and was in fact . He also hinted at a confirmation of what McAfee, SecureWorks and other security firms said today, that the attacks had some kind of political agenda.

"The ongoing, massively coordinated attacks on Twitter this week appear to have been geopolitical in motivation," posted just before 2 p.m. Eastern.

"However, we don't feel it's appropriate to engage in speculative discussion about these motivations," Stone said.