'Then again in a chat room,'

• However brief?
• IMer's "Then again ... "
• Start of a contrarian tweet
• "Then again ...," to a texter
• However, in a tweet
• "Then again," in texts
• Tweeter's "conversely"
• "However," in tweets
• "However ...," in texts

Wiktionary Word definitions in Wiktionary
init. (alternative case form of OTOH English)