Google Inc co-founder Sergey Brin said on Thursday advertising on social networking sites such as Facebook and MySpace was getting better, but was still not perfect. "In general, it's been improving but we still have a long way to go," Brin told reporters on the sidelines of a conference in Jerusalem to mark Israel's 60th anniversary. "Things have been going well this year...it's hard to predict where social networking will come out."

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