DeletedUser218 Storing messages doesn't matter since they are e2e encrypted anyway. Rummaging through your contacts list allows them to see all your acquaintances, their phones, e-mails, addresses, bday etc. Basically all info you keep in contacts. This is where Contact Scopes feature comes very handy. The sad reality is even if you don't save contacts, other people will have your data saved in their contacts for Meta to fish. Other than that, Meta also stores your standard billing data, who communicated with whom, when etc.