Here we go again...
I found a summary of conspiracy thories (陰謀論 (yin1mou2lun4)) about the lost plane. If you don't feel like reading the whole article just take a look at the list below:

1.The plane could be in Taliban-controlled regions;
2.Chinese satellites spotted the wreckage (what would be the conspiracy here?...);
3.„I saw the plane coming down” (Mike McKay's letter – he eye-witnessed something burning);
4.5 hours of radio silence (this isn't a „conspiracy theory” either...);
5.Terrorists crashed it;
6.Passangers' phones are still ringing (something I have not heard of before: „Apparently even if the phone in question is in airplane mode -- or is off or terminally broken -- it may still ring on the caller's end, despite there technically being no chance of it being connected.”);
7.The invisible aircraft: the plane was taken below the radars to Vietnam – a company named Freescale is mentioned here (worths browsing for it...);
8.MH370 exploded mid-air;
9.In the jungles and waters of Vietnam;
10.Pilot comitted suicide;
11.Aliens kidnapped the plane...

http://www.rediff.com/news/slide-show/slide-show-1-10-weird-conspiracy-theories-on-flight-mh370/20140314.htm