Twitter has added two-factor authentication to its accounts. Users will have to add a phone number and e-mail address to protect their account. Facebook already offers log-in verification, but earlier this month introduced a Trusted Contacts feature. News organizations and fast food restaurants have fallen victim to Twitter hacks in recent months. The Associated Press’s account was compromised and hackers tweeted about explosions at the White House last month. The social network has stepped up its security efforts in the wake of the hackings.”]