Key stocks to watch on Monday:Citigroup (C) - despite a big EPS beat for Q1, the large bank stock traded down on Thursday. Ignore some of the day to day nonsense in this stock as Citigroup still trades below tangible book value that sits above $65. Tesla (TSLA) - what isn't Tesla going to make in the future? The new plans for a semi and a truck should be worth $50 each the way investors trade this stock. Just remember that one is playing the Hope trade and not the Profit trade. Snap (SNAP) - Instagram has successfully stolen all the future here. No reason exists to pay a premium here. A big loss on Monday could easily lead to a new 52-week low at $18.90. More research: Snap Shareholders Are Dead. Zynga (ZNGA) - CSR Racing 2 has made a splash into the top 20 grossing rank on the iPhone after the April 12 update. The move likely doesn't last, but any sustained position would boost the stock. Either way, the stock continues to offer limited downside risk with plenty of upside on any big hit. 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 the daily blog posts from Out Fox The $treet.Disclosure: Long C, ZNGA