It seems social networks still have a long way to grow. Forbes has come out with its annual list of the fastest-growing tech companies and has found that social networks LinkedIn and Facebook grew faster than any other companies over the past year. Forbes has now named LinkedIn the world’s fastest-growing tech form for two years in a row, which the publication attributes to the social network’s strength in “recruiting tools, advertising and subscriptions.”  The list, which is generated from data on companies’ 12-month sales growth, three-year average sales growth and estimated earnings per share growth, also shows that Apple is still the third-fastest growing tech company in the world despite perceptions that the company’s growth has stalled in recent quarters, and Facebook sites in the No.2 spot.