Twitters experiment with promoting its Favorite button seems to have worked, and now its looking to see what else the button can do. The new experiment was originally spotted by Yahoos Drew Olanoff. Twitter already offers push notifications for tweets, albeit buried inside a menu on user profiles. But the company has frequently experimented with re-launching features, and favoriting is likely no different. Most recently, Direct Messages were resuscitated as one of Twitters most prominent features after having long been regarded as an afterthought.