Why would they replicate this service? They'd "destroy" the function of favorites for some revenue? Are they that desperate? These aren't ads. These are "pers

Why would they replicate this service? They'd "destroy" the function of favorites for some revenue? Are they that desperate? These aren't ads. These are "person abc favorited your tweet" notifications that the mobile twitter client pops up, and twitter emails you. If that gets overrun by spam (a) people will turn them off and (b) favorites will be useless as a mechanism for displaying "top tweets" like they do.