Axios

China’s Huawei unveiled the Mate X, a $2,600 5G folding-screen phone, on Sunday at the Mobile World Congress in Barcelona, challenging Samsung's new bendable device and the consumer threshold of pricey mobile phones, the AP reports.

The big picture: Huawei is pushing premium products in Europe and at home in China as it remains unlikely that their phones will be sold in U.S. anytime soon due to trade and security concerns.

Go deeper: The Galaxy Fold pushes smartphone prices to new heights

Chicago's extensive web of surveillance cameras was key to law enforcement's success in tracking down Jussie Smollett's two co-conspirators, who helped the "Empire" actor stage an allegedly fake hate crime for which he has since been charged, the AP reports.

Details: By leveraging Chicago's colossal camera network — which has more than 32,000 cameras on buildings, poles, buses and even some private residences (with the owners' permission) — detectives were able to track the men's movements after the attack. Investigators used footage from the men's cab — whose driver they also interviewed — and following the vehicle "along a trail of cameras" to Chicago's North Side. They also reviewed "telephone logs, ride-share records and credit card records" as evidence to bring charges against Smollett.

Wall Street Journal testing revealed that at least 11 popular apps, with millions of downloads to date, have been sharing highly personal data with Facebook.

Details: When users share their body weight, blood pressure, menstrual cycle, or pregnancy status with certain apps, that information is sent to Facebook and often matched with the Facebook profile of that user. At least 6 of the top 15 health and fitness apps in Apple’s iOS store — including iFlo Period & Ovulation Tracker and Instant Heart Rate: HR Monitor — sent sensitive user data to Facebook immediately after the information was collected. Per the WSJ, these apps frequently send this data without any disclosure to users.

Go deeper: What Facebook knows about you

Twitter co-founder Ev Williams is stepping down from the company's board after 12 years.

Why it matters: Williams helped start the company in 2006 and was Twitter's CEO from 2008 to 2010. He's currently running Medium, an online publishing service, while also investing in startups.