NEW YORK (TheStreet) -- After posting a big rally on Tuesday, the S&P 500 is at it again, climbing 0.4% on Wednesday. Stock traders, however, were focused on Twitter , as the stock plunged 14% to 52-week lows at $31.30. The shares initially climbed in Tuesday's after-hours session, after the company reported second-quarter adjusted earnings and revenue that beat estimates and provided a full-year revenue growth projection that's slightly ahead of analysts' expectations.