Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

How does one value Facebook stock as a potential investment?
To know if a stock is undervalued is not something that can be easily assessed (else, everybody would know which stock is undervalued and everybody will buy it until it reaches its "true" value). But there are methods to assess the value of a company, I think that the 3 most known methods are: If the assets of the company were to be sold right now and that all its   debts were to be paid back right now, how much will be left? This   remaining amount would be the fundamental value of your company. That method could work well on real estate company whose value is more or less the buildings that they own minus of much they borrowed to acquire them. It's not really usefull in the case of Facebook, as most of its business is immaterial. I know the value of several companies of the same sector, so if I want   to assess the value of another company of this sector I just have to   compare it to the others. For example, you find out that simiral internet companies are being traded at a price that is 15 times their projected dividends (its called a Price Earning Ratio). Then, if you see that Facebook, all else being equal, is trading at 10 times its projected dividends, you could say that buying it would be at a discount. A company is worth as much as the cash flow that it will give me in   the future If you think that facebook will give some dividends for a certain period of time, then you compute their present value (this means finding how much you should put in a bank account today to have the same amount in the future, this can be done by dividing the amount by some interest rates). So, if you think that holding a share of a Facebook for a long period of time would give you (at present value) 100 and that the share of the Facebook is being traded at 70, then buy it. There is another well known method, a more quantitative one, this is the Capital Asset Pricing Model. I won't go into the details of this one, but its about looking at how a company should be priced relatively to a benchmark of other companies. Also there are a lot's of factor that could affect the price of a company and make it strays away from its fundamental value: crisis, interest rates, regulation, price of oil, bad management, ..... And even by applying the previous methods, the fundemantal value itself will remain speculative and you can never be sure of it. And saying that you are buying at a discount will remain an opinion. After that, to price companies, you are likely to understand financial analysis, corporate finance and a bit of macroeconomy.