Open Mailbox With Raised Flag on Facebook

What it signals here

reaction meaning

Used as a comment to indicate someone should check their inbox or Messenger.

comment use

Dropped under posts to say 'I messaged you' or 'check your other folder.'

boomer interpretation

Older users often use it literally to talk about physical mail, packages, or postal services.

group use

Used in community groups to indicate important messages have been sent to members or admins.

See it elsewhere