Possible Clues:

• "Alternatively," in a text
• Texter's "However ..."
• Texter's 'Then again ...'
• Texter's "Then again ..."
• Texter's "But ... "
• Texter's "however"
• 'However,' in tweets
• "Then again," in tweets
• Texter's "Then again ... "
• "Then again," in a text