UIA as tips.
There is a small exchange in China called YUNBI
https://yunbi.com/?lang=en providing BTS/CNY and BitCNY/CNY trading pairs. It issued a bitasset YUN which can be found and traded in BTS wallet easily.
You will get YUN for free when you make a deposit in YUNBI. Things become interesting after you link your Weibo (you can see it as the twitter in China) with your YUNBI account. Every time you post a weibo saying you want to sent a specific amount of YUN to someone, the YUN will be transferred from your YUNBI account to his, even if he doesn't has an account in YUNBI (the YUN will be reserved for him till he creates an account and link it to Weibo).
With YUN you can buy something from YUN store, like coffer, mug, T-shirt, Iphone, Kindle,etc.
BitCNY/BitUSD/BitBTC can be easily implemented to this tipping system.
It would be great if we have similar things on twitter/reddit/bitsharestalk.