Jim Cramer answers viewers' Twitter questions from the floor of the New York Stock Exchange. As Tesla's been doing well since earnings and just got an upgrade, Cramer reveals why he says to stay long the stock instead of booking profits. He also reveals with the Ebola issue going on, what kind of pharma plays he would look at. In response to a viewer who asks if Alcoa is still a good stock for the long term, Cramer urges people not to sell the stock, although he says it could go down before it goes up. Lastly, he advises investors to be very careful with SolarCity. Tweet your questions for Cramer every Monday using #CramerQ.