US firms Wilson Sonsini Goodrich & Rosati and Cooley have won roles on LinkedIn's upcoming initial public offering (IPO), reports The Am Law Daily.

LinkedIn, which had 90 million registered users at the end of 2010, is set to become the first of the major social networking websites to go public.

However, the company did not specify a timeframe for the listing in its S-1 prospectus filed with the US Securities and Exchange Commission (SEC) last Thursday (27 January).