I'm entirely aware that the only reason there isn't a tab for this on Facebook is that Facebook doesn't want it. It would obviously be easy for them to implemen

I'm entirely aware that the only reason there isn't a tab for this on Facebook is that Facebook doesn't want it. It would obviously be easy for them to implement it. It might, however be a compelling feature for whatever displaces Facebook to offer. It would require a business model that's not identical to Facebook's.