But whether these internet stars will continue outperforming is debatable as their growth slows, competitive forces increase and regulations creep in. This P/E metric compares the current S&P 500 index price with the 10-year average earnings per share (adjusted for inflation) to smooth out fluctuations in the business cycle data. Amazon, Google and Facebook are subject to the EU rules targeting unfair online ranking platforms under the Platform-to-business (P2B) law.