Sorry may be I didnt explain it properly. So lets say you want to go to a restaurant to have a lunch .. And you want to figure out what are the possible options available for you today.In case of a buffet you find out a restaurant and go to that restaurant only to find out the buffet entries are not what you wanted. But instead if the restaurant provide you option with whats special at that restaurant you can filter from that. Think of it like twitter but instead of tweets you get real time menu's on what the restaurants around you have prepared.

I can simply search on google/yelp whenever needed. Probably I did not understand what you mean by real time feed.