Market volatility and China on traders' minds

by CNNMoney Markets Staff June 16, 2011: 1:10 PM ET

The lack of post-IPO enthusiasm for Internet radio company Pandora has been a popular topic among investors on StockTwits. Click the chart for more data on Pandora.

NEW YORK (CNNMoney) -- Talk about the S&P 500 potentially going negative for 2011 was among the top-trending topics on StockTwits on Thursday, a day after the S&P 500 fell about 1.7%..
The S&P 500 was less than 10 points of its 200-day moving average on Thursday -- a key technical marker for any index -- before bouncing off those levels.
Traders speculated if Thursday's gains may be a sign there might be some short-term buyer support in the market. The S&P would be negative for the year if it falls below 1,257.64 and its 200-day moving average is roughly near that level at 1,256.81.
StockTwits users also focused on Goldman Sachs upgrading the Chinese online video site Youku.com to a "conviction buy." The upgrade comes after Youku (YOKU), Renren (RENN) and other China Internet stocks have struggled in the past six months.
Pandora's (P) initial public offering also continues to be popular topic among traders, particularly after the stock has struggled since debuted a day ago. Pandora shares briefly fell below $16 a share, the company's original offering price.

China: Why U.S. investors should steer clear

Here are some of the highlights of Thursday's conversation on StockTwits.
DougKass: today impt day. if market can rally off awful philly fed we have probably made a trading low. that's my bet.
Tiny: I don't think we get a good bounce until at least the 200 day moving average is tested $SPY.
momomiester $YOKU goldman put them on the conviction list. That could solidify the bigger Chinese stocks in general. They all are crushed.
JoeSaluzzi Maybe black t-shirt guy from $P should do some more interviews on tv to try to get his stock price back over its IPO price.