Investors love Twitter again — but their excitement could scare off any potential buyers (TWTR)

Investors bid up shares of Twitter on Thursday after the company posted better-than-expected fourth-quarter results. The stock's surge came despite the fact that it had already risen 40% in the last year, and despite Twitter posting an actual sales decline for the year. For many investors, the best hope is that Twitter will be acquired, but the stock's jump could make the company less attractive to potential suitors. For Twitter, all of the recent good news may end up having some...