From ERE.net
Network Importance
Not surprisingly, LinkedIn is the No. 1 social recruiting source (with 93% of respondents using it). Of course, the very definition of job posting on LinkedIn’s network might not meet some people’s ideas of what is and isn’t social recruiting.
Facebook continues to grow as a source, with two thirds of those surveyed using it for recruiting purposes (and perhaps more will be if and when the company launches its new jobs section).
Twitter is growing at a similar pace, with more than 50% using the social network for recruiting.