The run-up in the stock price has dramatically increased its valuation, leaving investors to question whether they are too late.The forums on Reddit (RDDT -7.18%) have made it one of the sensations of the social media world in recent years. Many of the forums provide information and help users answer questions, making them an excellent resource.The company capitalized on this popularity when it launched its initial public offering (IPO) in March. Since then, Reddit stock has risen by more than 150%. Unfortu ...