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Twitter CEO Dick Costolo says his company is now seeing almost 250 million tweets every day, up from 100 million at the beginning of 2011. That’s a billion tweets every four or five days. Costolo made the comments in an on-stage interview with John Battelle at the Web 2.0 Summit in San Francisco on Monday night.

Twitter confirms it: People tend to wake up in a good mood and are happiest on weekends. The fast-paced forum is offering scientists a peek at real-time, presumably little-filtered human behavior and thoughts. Cornell University researchers turned to the microblog to study mood and found a pretty consistent pattern.

Hacker group The Script Kiddies successfully hacked another news organization when it logged onto USA Today's Twitter page and posted false statements Sunday evening.

People with accounts on both Facebook and Twitter have been able to update them both simultaneously for a long time -- but from Twitter to Facebook, and not the other way around. That’s about to change.

A hacker broke into the Twitter account of NBC News and sent out a handful of false tweets about a suspected hijacking and a plane attack at ground zero just days before the tenth anniversary of 9/11.

Twitter CEO Dick Costolo, announced a list of interesting engagement stats, and then slipped in this tiny piece of information in an informal business meeting on Thursday morning that “Users will begin to observe promoted tweets from companies you don’t follow.”

When it comes to spreading popular content around the web, where you post matters. A study that link-shortening service Bit.ly released on its blog Tuesday shows that different kinds of links rise and fizzle at different speeds — depending on the platform they are posted on.

Whether you've using the Internet or a cell phone (smart or dumb), here's how you can track Hurricane Irene, access the American Red Cross through Facebook and Twitter, schedule news alerts, connect with others and find loved ones.