Possible Clues:

• "i can't believe u said this"
• 'This can't be,' in texts
• 'So stupid,' in textspeak
• 'Unbelievable!' in texts
• 'I can't believe this,' in online slang
• Letters of online disapproval
• “I can’t believe this,” in texts
• Texter's 'I can't believe this'
• 'i can't believe u'
• "This can't be," in texts