best predictor of job performance is always: personality!!!

John and Ronda Hunter written last July 1984 "Validity and utility of alternative predictors of job performance. Psychological Bulletin, No. 96, pp. 72-98" (old but still valid paper) and found that psychological testing is a better predictor of job performance than any other single measure. Psychological tests have a validity coefficient of 0.53, analysis of information provided by the curriculum: 0.37, checking references 0.26, the level of education attained: 0.22 and 0.14 only for the job interview!

As for matching job seekers with employers, the best predictor of job performance is: personality!!!
See paper: "Workers Behaving Badly: Personality at Age 18 Predicts Workplace Deviance at Age 32" by Dr. Kimdy Le

The Wall Street Journal had published an interesting article about Xerox. 
"When looking for workers to staff its call centers, Xerox Corp. used to pay lots of attention to applicants who had done the job before. Then, a computer program told the printer and outsourcing company that experience doesn't matter.

The software said that what does matter in a good call-center worker—one who won't quit before the company recoups its $5,000 investment in training—is personality. "

What comes after Social Networking?
My bet: The Next Big Investment Opportunity on the Internet will be .... Personalization!
Personality Based Recommender Systems and Strict Personality Based Compatibility Matching Engines for serious Online Dating with the normative 16PF5 personality test. The market remains enormous!!