For roughly an hour and a half Twitter CEO Jack Dorsey's microblogging account was not in his control as hackers breached the security protocol. Chuckle Squad, a hackers’ group, believed to be behind the cyberattack, posted several tweets and even claimed bomb threat to Twitter headquarters in San Francisco. In damage control, Twitter secured the control, and clarified that there was no indication that the social media giant’s systems have been compromised. The hack, Twitter said was carried through a firm acquired to help with the SMS service. Last week, the same group also hacked multiple YouTube celebrities' accounts.