The best recruiters use Twitter to reach potential candidates. In this three-part “how-to” series by social recruiting expert Jonathan Campbell, learn to search, market and engage employable tech professionals in 140 characters or less. Part 1: Search: You can treat the network as a database and search it for keywords and skills (nod to Open Web for making this so easy to do!). Part 2: Market: You can market yourself, your employer and/or your jobs to other people in the same network. Part 3: Engage: Most importantly, you can reach out to other people in the network and start a conversation. 