In the current market session, Facebook Inc. FB is trading at $158.67, after a 0.6% decline. However, over the past month, the stock decreased by 13.76%, and in the past year, by 9.12%. Shareholders might be interested in knowing whether the stock is undervalued, even if the company is performing up to par in the current session.

The stock is currently higher from its 52 week low by 16.48%. Assuming that all other factors are held constant, this could present itself as an opportunity for investors trying to diversify their portfolio with Internet Content & Information stocks, and capitalize on the lower share price observed over the year.

The P/E ratio is used by long-term shareholders to assess the company’s market performance against aggregate market data, historical earnings, and the industry at large. A lower P/E indicates that shareholders do not expect the stock to perform better in the future, and that the company is probably undervalued. It shows that shareholders are less than willing to pay a high share price, because they do not expect the company to exhibit growth, in terms of future earnings.

Most often, an industry will prevail in a particular phase of a business cycle, than other industries.

Compared to the aggregate P/E ratio of 20.01 in the Internet Content & Information industry, Facebook Inc. has a higher P/E ratio of 24.82. Shareholders might be inclined to think that Facebook Inc. might perform better than its industry group. It’s also possible that the stock is overvalued.

Price to earnings ratio is not always a great indicator of the company's performance. Depending on the earnings makeup of a company, investors may be unable to attain key insights from trailing earnings.