Something big may be happening to user experience. Bing and Google will soon be showing tweets as part of the search results (they have both licensed the full Twitter firehose and Marissa Meyer yesterday demoed a version of “Social Search”). Google is already returning videos from Youtube as search results and apparently will soon be offering music. Bing video results can be played right on the results page. Facebook just announced music gifts that can be played right inside of the news feed ...