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I want to delete my account but a lot of my friends use fb messenger (groups ect.). Is there a way to delete profile and keep only messenger ?

If I could keep Messenger + Events and get rid of the rest, I'd do so immediately.

You can use Messenger with just a phone number, like whatsapp

There is/was a Facebook Group app, where its just the groups

The former, yes. But afaik the Facebook Groups or Local (Events) apps require a full account.