For a crowdfunding site seeking to raise startup venture capital, I don't believe the word "share" fits. Sharing is more about compassion and benevolence. I believe better choices would be...
VentureFund.com
StartupFund.com
StartupVentures.com
which are probably taken but the best .COM domains were taken years ago (though there are occasional drops and investors looking for liquidity). I wouldn't waste time with the new TLD version as no serious venture capital fund is going to launch a primary site in 2015 on a new TLD. Ten years from now we can revisit but thirty years after the launch of .Net I have found it difficult to sell .nets for much more than low $XXX. Fifteen years after the launch of .TV I have occasional sales but generally high $XXX to very low $XXXX - not worth paying $30/each in renewals.