Buying Twitter would be a challenge for a number of reasons, The New York Times reports.
Facebook's Sheryl Sandberg shared her views on the internet ad market and more in an interview with CNBC's Julia Boorstin.
Facebook has 4 million advertisers, up from 3 million in March, COO Sheryl Sandberg tells CNBC.
Twitter, which is said to be entertaining buyout bids, may have Microsoft as a potential suitor, a source told CNBC.
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