Stocks to watch on Friday: Twitter (TWTR) - another analyst upgrade is another indication of how the data privacy issue isn't a concern for Twitter. All signs continue to show that live video is driving ad revenue growth and the Facebook (FB) issue could help attract more advertisers to the platform. Plenty of upside from the $40 price target. Spirit Airlines (SAVE) - $3 fare hike is bullish for the airline sector. Stick with American Airlines Group (AAL) and United Airlines (UAL) until the stocks trade at more normal P/E multiples. Remember that United only trades for $70 with a credible plan to earn around $12 in 2020. Apple (AAPL) - any stock weakness is just another opportunity to use the massive cash balance to repurchase stock on the cheap. Click on the Sign in/Sign up button in the top right corner to join for free to comment on your stock moves for tomorrow. Click on the Follow button to get daily blog posts from Out Fox The $treet. Disclosure: Long TWTR, AAL, UAL, AAPL