How to block Facebook on iPhone

Because the unread-notification count is a guilt mechanic. A red badge over the icon is a tiny implicit obligation: someone wrote you something, someone tagged you, someone in your group asked a question. Most of those don't actually need a reply, but the badge does its job. Removing the badge is half the work of putting Facebook down.

Yes. Facebook and Messenger are separate apps. Blocking Facebook with iOS Screen Time or Unglue leaves Messenger fully working. If Messenger is the actual reason you keep Facebook installed, this is the cleanest split.

Block the main Facebook app and the facebook.com domain in Safari (Settings > Screen Time > Content & Privacy Restrictions > Web Content > Never Allow). Groups live inside the Facebook app and website, so blocking them blocks groups. Messenger stays untouched.

Possibly, and that's worth a real conversation. Tell the friends who use Facebook events that you've stepped back, and ask to be reached by text for things that matter. In our experience the “but events” worry is usually larger in your head than in your calendar.

Marketplace lives inside Facebook. If you actively use it (buying, selling, hunting for a bike), use an App Limit instead of a full block, so you can open the app for a capped window each day and still get to Marketplace. Or use Unglue, where opening Facebook costs a real task or focus session, so casual scrolling stays expensive but a targeted Marketplace check is cheap.

Unglue blocks Facebook and the equivalent Safari domain by default, then asks you to do one real thing to unlock a window. The block is the start of the system, not the whole system. The middle act, photo task or focus session, is the thing that breaks the autopilot.