http://gigaom.com/2010/12/23/someone-is-trading-stocks-based-on-you...

 

In the movie Minority Report, the government tried to predict future crimes by using a trio of “pre-cogs” who had visions of what was going to happen while lying in some kind of chemical bath.
Stock traders don’t have that kind of setup yet, but they are doing
everything they can to predict the future — and that involves crunching
every bit of data they can get their hands on, up to and including that
tweet you just posted. The New York Times recently described this phenomenon, and a hedge fund says it plans to launch a new fund that will trade stocks based in part on an analysis of market sentiment as defined by Twitter.

Stock traders have always looked at market-sentiment indicators, including some who study fashion trends or popular music to try to determine which way stock indexes are likely to go. It’s a little like science and a little like voodoo, as even some traders will
admit. But the key is information — as much information as possible —
and investment banks and hedge funds now have more of it than they could
ever want, and the computing power to take advantage of it by crunching
and analyzing it.

In a sense, they are doing the same thing Google does, but they are doing it in order to figure out which stocks to buy, not because they want to serve up related advertising. This is just part of the future of what we call “big data.”

The Times story describes how information services such as Dow Jones, Thomson Reuters and Bloomberg are trying to cater to this demand for more data by adding features to the terminals and software they sell to banks and investment houses, which tries to parse the sentiment
of news stories, blog posts and even Twitter messages based on the use
of common words and emoticons like the “smiley.” One portfolio manager
at an equity fund says he feeds that data into his trading systems, and
that such features give him “the ability to assimilate more
information.”

Meanwhile, a hedge fund called Derwent Capital Markets says it will launch a new fund in February that will trade based in part on analysis of Twitter sentiment. This approach is built on research from the University of Manchester and Indiana University
(PDF link) that showed how the number of emotional words on Twitter
could be used to predict moves in the Dow Jones index. Researchers said
they found that a change in emotions as expressed on Twitter would be
followed by a move in the index between two and six days later, and that
this method had greater than 87-percent accuracy.

The fund is apparently going to use other data in its analysis as well, but since the fund company has signed an exclusive deal with the researchers who published the sentiment paper, it sounds like tweets
will play a major role in the trading. Will it work? Some are skeptical —
including Reuters blogger Felix Salmon.
My only question is: How long until someone starts setting up spam or
bot accounts to try to game specific stocks? I’d give it about a week —
if they don’t exist already. Welcome to the future.

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yeah this is really nothing too new. The Index and margins on the exchange have been manipulated via the same process. People do it on youtube as well to create a fake manipulated trend for their channel or desired video to gain popularity. Facebook also takes advantage of this. They do the same thing to people's profiles that post things that fb does not agree with, and thus your profile/info is pushed down to the bottom of the popularity trending index.

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