Shares of Twitter have been on fire throughout the month of December tripling from its IPO price of $26. That was until Friday's session, when Macquarie Capital's analyst downgraded Twitter's stock to 'underperform,' triggering a massive selloff. S&P Capital IQ's Senior Equity Analyst, Scott Kessler, says while the company has great potential the selling is warranted. His price target is $43, a far cry from even Friday's bruised levels of roughly $65. TheStreet's Jeanne Yurman reports from New York.