User engagement seems to have dropped for Twitter. Among the positive outcomes, Twitter has managed to have positive cash flow this year and its revenue stands at an impressive $2 billion. Nonetheless, there is increased competition from the likes of Instagram, Snapchat and Facebook.
One thing to keep in mind is that is very easy to interact with people on Twitter and there is considerable value in that. Some of the best and brightest minds post regularly on Twitter. It is very common to see those that are at top of their fields posting frequently on Twitter and also some of the best professors at world's top universities.
Twitter is a rich data mining source, though. It may be soon that Google and Facebook may decide to buy the platform. Until, Twitter figures out a way to return money back to shareholders, it will continue to be a stock to short most likely.