One of the questions that came up was why be on LinkedIn if I am on Facebook? Good Question, but the reason is they are two different social mediums. LinkedIn.com is a professional networking environment and Facebook is more of a friends networking environment.
You need both, but for different reasons. LinkedIn for professional contacts and business relationships, and Facebook for friends and connections from other organizations not professional.
Recruiters use LinkedIn.com to find their best candidates. This has been a known fact for a long time. For those who are on it, and keep their profile up-to-date and active they know it. http://blogs.forbes.com/elainewong/2011/01/18/why-linkedin-is-every-recruiters-hot-search-tool/?boxes=financechannelforbes.
The above article makes reference to why other sites which offer job hunters opportunities is not the way to go. Staying active on LinkedIn and being active in Groups and looking for work in the field of your ability within the connections you have is the best way to find open positions.
Your connections on LinkedIn.com will know of openings before the job sites do. Keep this in mind. Job sites are not the place to find the most recent opening, and sometimes, by the time you see the opening, it may have already been filed.
Make your Profile 100 percent on LinkedIn.com and keep it current. Make your contacts aware of your search, but offer to help others as well. Do not be the one with your hand out , help others and then your help will arrive.