Facebook CEO Mark Zuckerberg speaks at Facebook Inc's annual F8 developers conference in San Jose, California, May 1, 2018.

It's not just Instagram Stories that Snapchat has to worry about.

Facebook and Messenger Stories now have 300 million daily active users, the company announced Wednesday. A user counts as one person, meaning they would not be counted twice across both apps. Facebook did not share the breakdown between each app.

By comparison, Snap-owned Snapchat reported 188 million daily active users in its second quarter earnings report in August.

Facebook also announced plans Wednesday to roll out ads to Facebook Stories globally, which will operate like Instagram Stories ads.

The company said it isn't concerned about its own apps competing for Stories users. An Ipsos study commissioned by Facebook found 68 percent of people use a "stories"-like feature on at least three apps regularly.

A person's Facebook Story is automatically posted on Messenger. Users also can opt into sharing their Instagram Story on Facebook.

Correction: Snapchat reported 188 million daily active users in Q2. The original version of this story had a lower number.