YelpInc., the online review website, has picked Goldman Sachs Group Inc. and Citigroup Inc. to lead an initial public offering that could value the company at up to $2 billion, according to people familiar with the plans. Yelp intends to file its IPO plans publicly within the next few weeks, said one person familiar with the matter. It's aiming to complete the sale in the first quarter, though timing may change with market conditions, the person said.