Twitter is adding video content to bolster ad revenue in...

Twitter is adding video content to bolster ad revenue in a bid to reach $1 billion in sales by 2014. Credit: Getty Images, 2011

Twitter Inc. chief executive Dick Costolo said that the company is

working on a feature that would let users download short blogs posted to the site.

Tweets, brief messages containing 140 characters or less, may be downloadable before the end of the year, Costolo said at a conference in San Francisco.

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