levo - 12:05 pm on Sep 20, 2012 (gmt 0) [edited by: levo at 12:06 pm (utc) on Sep 20, 2012]
I think they are going to use them for grouping articles - just like hashtags. The better it groups, the better it knows which events/stories are "trending".
Our articles are selected and ranked by computers that evaluate, among other things, how often and on what sites a story appears online.
[edited by: levo at 12:06 pm (utc) on Sep 20, 2012]