Yelp (YELP -6.9%) has sold off as Facebook (FB -2%) shows off Graph Search; investors seem to to be fretting Yelp traffic will be hurt as Facebook's tool is used to search for businesses a user's "friends" have visited/liked. However, Graph Search is far from a direct rival. Google (GOOG -0.2%) has slipped a little after Mark Zuckerberg notes Bing (NASDAQ:MSFT) will be a fallback option for searches. Zuck: "Graph Search is a really big project that will take years and years to index the whole map and the graph" (live blog)