Jack Dorsey

Facebook and Twitter are taking down terrorist posts. But such vigilance comes at a high price.

So far, CEO Jack Dorsey has not been able to deliver on his promise to get Twitter back on track.

Yes, you can opt out.

The new appointment comes after four top executives left Twitter.

Twitter's stock has fallen nearly 50 percent since Jack Dorsey returned as CEO last year and is now trading below its IPO price.

Twitter has been throwing things on the wall, but few have stuck.

Stop worrying about how long tweets are. Twitter is just catching up to other social networks.

Twitter is considering upping the limit to as many as 10,000 characters.

The 42 percent drop from a year ago suggests widespread uncertainty about the profitability of the payments industry.

Kordestani's appointment allays concerns about Co-founder Jack Dorsey's dual role as head of the mobile payments company Square.

The move will eliminate 8 percent of Twitter's workforce in an effort to cut costs and spur growth.

The news comes just after Jack Dorsey was appointed permanent chief executive.

For those who don't spend all day on Twitter or get why it's useful, here's an attempt to reveal the "magic" of the platform.

Dorsey will remain head of fast-growing mobile payments company Square, potentially setting up conflicts of interest.

The microblogging platform is struggling to attract users and may ditch its 140-character limit.

Dorsey was previously fired as CEO in 2008.

The social media giant took down 13 of the 16 most prominent propaganda distributors.

The threat was posted on Just Paste It, a text- and photo-sharing platform.