Netflix shares surged over 10% after reporting Q4 earnings that beat estimates. Revenue of $8.83 billion was up 12.5% year-over-year, and subscriber additions topped 13 million, beating consensus estimates. Most analysts on Wall Street applauded the results, upping their price targets. However, some warned of overvaluation and risks to sustained subscriber growth. Netflix's double-digit subscriber gains may not continue as the effects of its password crackdown fully materialize.