Inc. magazine is launching IncBizNet tonight, a beta social net aimed at CEOs of the fastest growing privately held companies to promote their businesses and connect with other businesses. The tagline: “The Networking Community for Private Companies.” The companies are on the new Inc, 5,000 list explained here. We heard that during a breakout on “social” at Wednesday’s Networked Journalism Summit, Ed Sussman, president of Mansueto Digital, said the plan is to “work it very hard.” They have a staff of around 15 people who will be recruiting for the site full-time.” One way in for now.

Via the preview site, features include the ability to distribute press releases for free across the Mansueto Ventures media network, common-interest community sites, business directory, a company blog that can be created there and exported.