Sergey Brin popped in at O'Reilly Publishing's Web 2.0 Summit last week, and the Google co-founder took a few minutes to discuss Google (then) just-announced search deal with Twitter , efforts to find revenue streams through social networks, pending new technologies, and even Microsoft's Bing (Brin says he uses the search service). Here he is talking to John Battelle , via Fora.tv: