Possible Clues:

• 'Incidentally,' in a text
• "Incidentally," to texters
• "Incidentally," in a text
• FYI relative
• Texter's segue
• Texter's "Incidentally"
• “Incidentally,” online
• 'Incidentally...' in texts
• Start of a texter's aside
• Start of a modern afterthought