Cramer's lightning round: I am 'betwixt' by the bitcoin mania in Square By: CNBC.com News December 20, 2017 at 18:50 PM EST Jim Cramer zipped through his take on callers' favorite stocks, including a fintech play that's been associated with bitcoin. Read More >> Related Stocks: Axt Inc Bitcoin (Bitstamp) Bitcoin Composite Block Inc Groupon Cl A Marriott International Post Holdings Inc