Twitter co-founder Evan Williams used an appearance at the final day of the Web 2.0 conference to air his concerns about the one-way nature of his microblog's relationship with Facebook. Twitter users can post tweets on Facebook, but not vice versa. "They see their social graph as their core asset," Williams said. "We're talking to them often, [and] neither side has found a way to do that." The final sessions also included chats with executives from Netflix and LinkedIn, as well as an appearance by FCC Chairman Julius Genachowski.