To a very limited extent, it’s already happening. But if former Bing product lead Mark Johnson is right, it’s going to be a long time before we see much more progress in that area. If every user that comes [to Bing or Google] is getting a personalized experience based on Facebook data, based on the web graph, based on the social graph – holy crap, that’s a lot of processes to do, Johnson notes. He’s quoted by Austin Carr in an article for Fast Company. To Johnson, it’s a matter of economics. Interpreting all of those social signals would involve huge server costs. Neither Bing nor Google wo…