Yahoo patents granted on 27 October 2015

4 US patents granted on 27 October 2015 and assigned to Yahoo

1 9,172,666 Locating a user based on aggregated tweet content associated with a location
2 9,171,258 Distributed collaborative knowledge generation system
3 9,171,231 System to compile landmark image search results
4 9,171,000 Method and system for mapping short term ranking optimization objective to long term engagement