On your Facebook pixel page, you'll see your pixel and what status it's in:

No activity yet: This means that we haven't received any events from this pixel. Visit the web page that the pixel was placed on and use the Pixel Helper Tool to make sure that it's been properly installed. Learn more.

No recent activity: This means that conversion events have been recorded in the past from this pixel, but there have been none in the past week. If your Facebook pixel has no recent activity and you want to test that it still works, visit the web page that the pixel is on to get it to record an event.

Active: This means that we've received events from this pixel in the past week.

* Nguồn: Facebook