Below are some links of interest (some already posted to Twitter). I may or may not continue with this, given that there are already some good link pages on the web (in particular, Abnormal Returns). Nonetheless, I may at least organize some recent Twitter posts every day or so.

• Today's earnings calendar (Breifing.com).
• Overview of High Frequency Trading (Clusterstock). HFT in C, BAC, and CIT explained (Zero Hedge). Interesting, and scary stuff. Are high-frequency trading and liquidity rebates keeping CIT over $1 per share? (Zero Hedge, The Pragmatic Capitalist).
• Insiders at Smuckers have been exercising options and selling shares at highs for the last two summers (WSJ). Should you?
• Developers Diversified Realty (DDR) to be the first in commercial real estate to use TALF (WSJ). Are alternative investments to follow?
• Who is laughing now? Variable annuities have been one of the better investments over the last decade (WSJ). But they are still boring.
  
• A Bloomberg Global poll has 61% of investors saying the world economy is stable or improving, with almost 75% taking a favorable view of Federal Reserve chairman Bernanke (Bloomberg). So naturally, he is probably toast.
• Is the NYSE Bullish Percent Index approaching lunacy areas? (ES & EC Futures Analysis)
• Calpers in down 23.45% for the fiscal year (WSJ). Now there is some talk about whether governments will need to sure-up various pension funds. But where will the money come from?
• Inverse relationship between price and volume (The Pragmatic Capitalist). Will this summer be different?
• StockCharts.com Charts on the Blog (VIX and More).
• Bull market for emerging markets (Carpe Diem). Topping, or just getting started?
• Do superstition and eclipses matter for the stock market? (Marginal Revolution) Groovy man.
  
• Death and taxes, and the federal budget. Where your money is going (The Big Picture)?
  

Traders who are clients of StreamBase are using software developed by the company to scan Twitter for information that can be utilized by their algorithm-based automated trading platforms (see Telegraph article). While the company is not specific about who is using the software to follow Twitter feeds, current clients of the company include the Royal Bank of Canada and hedge fund BlueCrest Capital Management. Those using the software to monitor the Twitter feeds hope their automated trading platforms can utilize breaking news that has not yet been filtered by providers such as Reuters Thomson or Bloomberg. One trader mentioned how using a broadcast tool such as Twitter would allow them to further take advantage of the ability to "buy on the rumour and sell on the facts." Given the volume and variety of the content you find on Twitter, or for the matter, any message board or social networking site, the term "rumor" is probably a little generous in many cases. For their sake, let us hope that those firms following any social networking site have a good AI system for separating the wheat from the chaff. This tasks is hard enough when all you are following are those slow "filtered" news sites.