1 Canker sores are small, painful ulcers on the inside of the mouth, tongue, lips, or throat.  Symptoms of canker sores include small, painful, crater-like ulcers.
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Tencent is one of the largest Internet companies, as well as the largest gaming company in the world. Its many services include social network, web portals, e-commerce, mobile games and multiplayer online games. Offerings in China include the well-known instant messenger Tencent QQ and one of the largest web portals, QQ.com. Mobile chat service WeChat has helped bolster Tencent's continued expansion into smartphone services. Tencent holds 15% stake of JD.com, one of the largest B2C online retailers in China.