A retail deals site called Groupon has raised a whopping $30 million Series B funding round led by Accel Partners, one of Facebook's early backers. Existing Groupon investor NEA, which led the company's $4.8 million Series A round in January 2008, also contributed. - Mitchell Tsai from Bookmarklet

Here is the gist of Groupon: there are currently editions for 26 U.S. cities. The site advertises a deal each day from a selected local establishment like a restaurant, nail salon, or gym. There's a heavy discount involved. But enough members have to opt into the deal in order for any of them to get it. Groupon takes a cut of earnings if the deal hits the "tipping point" and goes live; otherwise, the featured merchant does not have to pay. - Mitchell Tsai