Facebook's Sheryl Sandberg is testifying alongside Twitter's Jack Dorsey.
Twitter registers drop in market value by more than $6 billion as it begins containing online hate and trolls that has in turn hurt its standing with investors and declined its monthly users.
Twitter said on Tuesday that it would begin a test with a random sample of users allowing them to send tweets that are as long as 280 characters, doubling the existing cap.
After years of losing money and multiple failed attempts to revive its business, the popular micro-blogging app is looking for a buyer.
The social media site is being updated to make conversation easier and faster, as well as to attract more users.
According to Bloomberg, photos and links will no longer affect the 140-character tweet limit.
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