Possible Clues:

• 'Hilarious!,' in a text
• “lol,” escalated
• 'Hahahahahaha!'
• Response from a greatly amused texter
• 'u r hilarious!'
• Online 'Very funny!'
• 'OMG, I'm cracking up!'
• 'U so funny'
• 'OMG 2 FUNNi!'
• “That’s hilarious,” in texts