What is how to respond to laughing emojis?

As an AI language model, I don't have feelings and emotions so I cannot perceive the context in which the laughing emoji has been used. However, generally speaking, if someone sends you a laughing emoji, it could mean that they found something amusing or funny. In such a case, you could respond with a simple “Glad I could make you laugh” or “I'm happy that I could bring a smile to your face”. Alternatively, you could also use a laughing emoji back or a humorous phrase to keep the conversation light and playful. If you are unsure of the intent behind the laughing emoji, it is always better to ask the sender for clarification before responding.