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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.

Jack Ma, chief executive of Chinese Internet company Alibaba Group Holding Ltd, told an audience at an event at Stanford University that he was "interested" in buying Yahoo Inc.

Today at the China 2.0 conference at Stanford, Alibaba Groups’s Jack Ma replied to a pointed question about buying Yahoo with, “We are very interested in Yahoo. Our Alibaba group is important to Yahoo and Yahoo is important to us … All the serious buyers interested in Yahoo have talked to us.”

David Zaslav, CEO of Discovery Communications, called his company's licensing pact with Netflix an 'economic win' and also said there's a disconnect between the strong advertising market and the overall economic malaise.

Chinese e-commerce giant Alibaba Group Holding Ltd. is aiming to handle one trillion yuan ($157 billion) of transactions in 2012 on its Taobao consumer sales platforms, the company's Chairman Jack Ma said Saturday.

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.”

And so it begins. After Yahoo this week gave CEO Carol Bartz the axe, the stock rallied on the suspicion on the Street that the company almost certainly has now been put into play, and might not last very long with its current corporate structure.

The sudden ouster of Yahoo CEO Carol Bartz wasn't triggered by one specific factor, but rather because Ms. Bartz wasn't reaching a series of performance targets.

Google said it will discontinue several products, as the Internet giant narrows its focus and doubles down on new efforts, including its Google+ social networking service, under CEO Larry Page.

Speaking to reporters on Thursday, Facebook’s CEO Mark Zuckerberg said that the social network has plans to “launch something awesome” next week. There’s no official word on what will be announced, but we suspect it’s going to be the new iPhone photo-sharing service that we saw just last week.