Groupon has begun installing multi-touch displays in Chicago that promote its Groupon Now local deals available for only a few hours. The displays serve as interactive advertising for Groupon's offers while duplicating the access users have on smartphones. Google will allow importing of past social media updates from services like Foursquare and Twitter into Google+. Google added recommendations to the +1 button so that when users hover over the button, they see related content from their Google+ network. Facebook is adding a "Like" feature to its Open Graph protocol so that likes in third-party apps appear as status updates on Timelines. Facebook also released a "Follow" feature to make it easier to follow stories from apps in News Feed and Timeline