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A hijacked Associated Press Twitter account that rattled markets with false word of an attack on the White House put the security of social media in the crosshairs.

The stock market rebounded from the nosedive triggered Tuesday by the bogus tweet and the AP posted a message on Twitter that its account "which was suspended after being hacked, has been secured and is back up."

The AP Twitter page indicated more than 1.8 million followers as of early evening in San Francisco, where the one-to-many messaging service has its headquarters.

What remained were questions as to whether security was tight enough on Twitter and other popular social networks in an age when people increasingly turn to posts from friends or strangers for reliable news and information.

Twitter was firm that evaluating and improving defenses at the service remains an ongoing priority and that the hijacking of the AP account didn't prompt any immediate moves to toughen security.

AP's Twitter account appeared to have been breached after hackers tricked someone into revealing a password with a deceptive email message in what is referred to as a "phishing" attack.

Some online reports contended that Twitter was considering "two-factor authentication" that would require users to either know something or do something aside from just type in passwords to access accounts.

"When you look at the problem in mass, the most critical thing we see is people just have horrendous passwords and use them all over the web," said Mark Risher, chief and founder of Impermium, an Internet security firm.

While incorporating a second step such as sending a confirmation code in a message to an email account or mobile phone associated with a user's account is a big improvement, even that defense is flawed, he said.

Risher was 'spam czar' at Yahoo! Mail before leaving the Internet pioneer and launching Impermium in 2010. His team includes Sameer Bhalotra, a former senior director of cybersecurity for the White House.

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Twitter security in crosshairs after AP account hijack