Possible Clues:

• 'U can't b serious!'
• "W-h-a-t-t-t-t!" letters
• Clickable tag on BuzzFeed beside 'LOL' and 'WTF'
• Chat room "Holy cow!"
• Texter's astonishment
• Pastor's excited blog letters?
• 'Wow!,' in a text
• Texter's "Shocking!"
• 'No way!,' in a text
• Texter's ''Unbelievable!''