Well, messaging history is just an example; I'm not actually sure if that is something which apps are allowed to lift, but I figured I'd err on the extreme end.

Well, messaging history is just an example; I'm not actually sure if that is something which apps are allowed to lift, but I figured I'd err on the extreme end. Either way, discrete and easy-to-digest information like 'likes' are exactly what they wouldn't have access to from Google, and honestly it seems like automated sentiment analyses are still very error-prone; large corpuses of text don't seem ideal for this sort of targeting.