For Artists’ Fund-Raising, a Social Network Site

United States Artists, a nonprofit group founded by foundations and wealthy art donors to broaden support for working artists, will unveil a new Web site on Tuesday that solicits small donations from regular people to help underwrite specific artworks.

Part social network, part glossy brochure, part fund-raising mechanism, the site seeks to democratize arts patronage as government support for the arts continues to decline and private sources of financing also shrink.