PartnerUp.com, a free social networking site for entrepreneurs, says many professionals in the residential real estate and financial sectors are leaving their jobs to take a stab at entrepreneurship. The survey, conducted by PartnerUp.com, found that of those professionals who left in the last three months, about 56 percent are considering starting their own business and 13 percent are already on their way. These new entrepreneurs are pursuing web companies and other technology businesses, in addition to advertising, marketing and retail. "The credit crunch has sparked entrepreneurship, but more importantly, entrepreneurship is sparking economic expansion," said Dane Fox, vice president of business development at PartnerUp.com.