Facebook's value on the stock market has now surpassed the value of major retailer Wal-Mart.
Twitter is making it easier for consumers to buy the products that they are tweeting about.
CNBC's exclusive talk with Dick Costolo and Jack Dorsey took an unexpected turn.
Here are four things Twitter needs to do to win back investors, says Michael Yoshikami.
Twitter employees have flooded the social network with messages directed toward CEO Dick Costolo
The embattled chief executive will be replaced by Chairman Jack Dorsey on an interim basis.
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Matt Hunter is the senior technology editor at CNBC.com.
Josh Lipton is CNBC's technology correspondent, working from CNBC's Silicon Valley bureau.