More First Round Capital portfolio news; Square, RockMelt get big investments

Following up on two companies I discussed in yesterday's First Round Capital Roundup: Mobile payments processor Square has raised $100 million in a third round of funding led by Kleiner Perkins Caufield & Byers; the new financing values the company at more than $1 billion, according to the Wall Street Journal. Square also added another powerful Board member, Kleiner Perkins partner Mary Meeker. Square was founded by Twitter's Jack Dorsey; First Round Capital invested in its Series A round in 2009.

While Facebook has been working closely with social web browser RockMelt on product integration, Facebook has not invested in the startup. But now one of its major backers has; Accel Partners teamed up with Khosla Ventures and Andreessen Horowitz to lead a $30 million round. Accel's Jim Breyer will join RockMelt's board. Marc Andreessen of Andreessen Horowitz knows a little bit about browsers, having been behind the development of Netscape. First Round Capital also reinvested in this round.