Possible Clues:

• "That said," in texts
• Texter's "Or ... "
• 'Conversely,' in texts
• "And yet," in an IM
• 'Alternatively ...,' in texts
• Texter’s “Alternatively...”
• 'However,' in textspeak
• Tweeter's "conversely"
• Tweeter's 'conversely'
• Alternatively, to a texter