Many recruiters watch the Twitter community, keeping an eye out for ideal candidates, says Rosenberg. One of the way you can stand out to these critical contacts: refer colleagues to them and help others before you help yourself.

"Recruiters are dealing with hundreds or thousands of candidates," Rosenberg says. "The only reason they help you above someone else is if you help them do their job. If you want to get considered for jobs in the future, help them pass information along or refer candidates to them. That's the best way to endear yourself to a recruiter's heart."