The "Fast Money" traders gave their final thoughts of the day.

Steve Grasso was watching the S&P 500's technical levels.

David Seaburg was a buyer of TWTR.

Brian Kelly had his eye on the .

Guy Adami was also watching key levels of the S&P 500.

Trader disclosure: On August 21, 2015 the following stocks and commodities mentioned or intended to be mentioned on CNBC's "Fast Money" were owned by the "Fast Money" traders: Brian Kelly is long BBRY, BTC=; DAX, DXGE, ITB, TAN, TSL, TWTR call spread, U.S. Dollar; he is short AUDJPY, GBPJPY, Euro, Ruble, Yen, Yuan. Today he bought DAX, DXGE, US Dollar. Today he sold VIX and Euro. Today he closed his CAC40 short position. Today he shorted Euro and Yen. Guy Adami is long CELG, EXAS, INTC, Guy Adami's wife, Linda Snow, works at Merck. Steve Grasso is long AAPL, BA, BAC, CC, DD, DIS, DECK, EVGN, FIT, KBH, MJNA, MU, PFE, PHM, T, TWTR, GDX. His kids are long EFA, EFG, EWJ, IJR, SPY. His firm and some of its partners are long WLL, DNR, DVN, TWTR, NE, NEM, OXY, RIG, TSE, VALE.