Linked in is a must for start-ups, unemployed people, people searching for better jobs, people keeping up to date on industry standards and standards committees

Linked in is a must for start-ups, unemployed people, people searching for better jobs, people keeping up to date on industry standards and standards committees, meet-ups, events. It's also a public list of who is connected to whom, because it shows who you really know. Another good point is that, the questions that get answered by experts, presumably unemployed, or in search of consulting gigs, are really good answers and the information on that site is sometimes genius for developers.