This one is difficult to estimate. But at this moment, I would not pursue it due to unknown risk level.
- Service domain is not fully scoped out yet: "LinkedIn makes money selling members premium subscription services, and hiring and marketing services." Seems not many people are using that "premium service".
- PE ratio is about 200 and profit margin is only about 6.5%, based on "The company earned $15.4 million in 2010 on net revenue of $243 million".
- Immediate and long-term future outlook is very muddy per "In a government filing, LinkedIn warned that it expects its revenue growth rate to decline and its costs to rise as it ramps up hiring and re-invests in the business, and that it will lose money this year. It may not be able to generate sufficient revenue to sustain our profitability over the long term."
*** This is very speculative stock.