Someone posted a smiley face emoticon on WeChat. How should I reply to him?

If you are a strange friend of WeChat, or are greeting you, first, check whether you are online; Second, greeting others usually doesn't directly hit the subject, so it's polite to send a smile first. If you are interested in talking to each other, you can answer with a handshake or greeting expression.

Emoji, originally just a network subculture, has been widely accepted by the society with the popularity of the Internet and mobile phone short messages. Later, many communication programs (especially real-time communication programs) and forums began to express their feelings with more vivid small icons. Therefore, at the end of the 20th century, a new word to explain these emoji appeared in English, that is, Emotion and small icon were skillfully combined to form the new word "emotion".

Don't use too many words to express your feelings, which can save time.