HBO Twitter pages hacked just weeks after cyber breach

HBO says it is investigating another hack where the company's Twitter and Facebook accounts were compromised overnight.The hackers warned the network's security was vulnerable.Anonymous hackers recently claimed to have stolen unaired episodes of popular HBO shows like "Game of Thrones."One post read in part, "Hi, OurMine are here, we are just testing your security."HBO regained control of the accounts within about 40 minutes and deleted the messages.