Mobile usage is the fastest-growing part of LinkedIn's business, but it's not a big revenue driver -- yet. That could soon change, as LinkedIn plans to test out advertising across mobile devices, now that it's gotten the product and user experience right on those platforms.

Source: http://feeds.digg.com/~r/digg/topic/tech_news/popular/~3/mAjV-QoTwdQ/linkedin_mobile_growing_fast_in_everything_but_revenue