The United States is ratcheting up national security concerns about TikTok, mandating that all federal employees delete the Chinese-owned social media app from government-issued mobile phones. Other Western governments are pursuing similar bans, citing espionage fears.

So how serious is the threat? And should TikTok users who don't work for the government be worried about the app, too?

The answers depend somewhat on whom you ask, and how concerned you are in general about technology companies gathering and sharing personal data.

Here's what to know:

HOW ARE THE U.S. AND OTHER GOVERNMENTS BLOCK...