Chinese version of Facebook, Renren, which has over 200 millon user made simi-like chatbot by SimSimi API.
User talk with chat-bot by simply "@chatbot_name" just like when they talk with friends.
Renren support this chat-function by SimSimi API. This chatbot has massive hits on Renren.
Now Renren user make over 1 million conversation per day.
Check out this link : http://page.renren.com/601621937?from=opensearch