However, in a tweet

• Alternately, as abbreviated in chat rooms
• "But let's consider," initially
• In contrast, in a text
• "Then again ...," in texts
• "That said ...," in a text
• Texted lead-in to an alternative
• Texter's "However ..."
• Emailer's "Then again ..."
• Internet shortening to introduce a different view

Wikipedia Word definitions in Wikipedia