SINA (NASDAQ:SINA) stock is down over 20% over the past year, continuing a downturn that started about two years ago. While there are plenty of reasons to remain bearish on China's main Twitter-like service, there are just as many reasons to be bullish about SINA's profit-earning potential over the long term.

In the video below, Fool contributor Kevin Chen details three key reasons:

  1. SINA's basically a big start-up with a risk-taking culture. It's not afraid to experiment as evidence by two new ventures.
  2. SINA has struck a key partnership with Apple. Now, once China Mobile (NYSE:CHL) begins subsidizing Apple's (NASDAQ:AAPL) iOS devices, SINA is sure to benefit.
  3. SINA has joined with Baidu to help power the search giant's cloud services and mobile operating system. While Baidu (NASDAQ:BIDU) has hit a rough patch, the company is still the 800-pound gorilla in the room, so once Baidu's fortunes improve, SINA is well positioned to skyrocket, too.

To learn more about the bullish case for SINA, watch the video below.

Fool contributor Kevin Chen owns shares of Baidu. The Motley Fool recommends Apple, Baidu, Google, and SINA. The Motley Fool owns shares of Apple, Baidu, China Mobile, and Google. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.