Before Facebook, Vu Kim Chi thought something was lacking in her job, which is to promote the economy in and around Vietnam's famed Ha Long Bay. Posting updates to her department's website, or photocopying missives to send to constituents, she said, was mostly one-sided. But after she set up an official Facebook page for Quang Ninh province, the conversations started to flow in both directions, between Chi and the local residents or businesses. That's why, when it comes to social media, she thinks more civil servants need to catch up with the rest of the country. "Social media, especially the Facebook application, is really used a lot in Vietnam," said Chi, who is deputy head of the province's investment promotion and support office. "But for public agencies that use it…