News bites: Priceline to buy Kayak for $1.8 billion

Travel company Priceline agreed to buy competitor Kayak for $1.8 billion, The Associated Press reports.

Some Securities and Exchange Commission computers were vulnerable to cyberattack, Reuters writes.

The Stuxnet virus, which was aimed at Iran, also infected Chevron's network, according to The Wall Street Journal

Twitter forced some users to reset their passwords but said it was not hacked, The New York Times writes.

Groupon failed to meet sales estimates, Bloomberg reports.