How to reply to "lol?"

sage-of-caring
In this age of text messages the form of communication has changed, but the communication has also changed. Have you ever been texting someone and got "lol" as a reply?

How are you supposed to answer that? Do you make a new subject or continue the old one? what if you don't have much else to say but don't want the conversation to die?
How to reply to "lol?"
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