How can I flirt online?

Hey guys I would like to hear your opinion on this one. I'm talking to a guy on instangram and i would like to go on a date with him. My friends say that he likes me because he was the one who started texting me and he sends me a lot of messages from time to time. I'm not sure though because I'm not used to flirting online so can you give me some tips on how to give him the sign that I like him and how to flirt with him?
How can I flirt online?
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