Whilst this is an unusual case - 99.99% of the time the access and currency of information available today actually makes for a much improved market.
"a non-detail-oriented securities analyst summarized the article (apparently without reading it first) and uploaded the summary to Bloomberg."
Should read: "a lazy and now-unemployed securities analyst..."
Quant firms played a very little role in the selloff. It was retail and some institutional investors seeing the headline come across on their Bloomberg terminal and immediately start dumping shares.
I use http://www.zecco.com for my standard stock trades as you get 10 free a month. Definitely not the most fully-featured broker, but it works and it's hard to argue with no-commission trades.
Damn I hate their security device though. It's kind of irritating to have to enter the security codes every time i want to make a trade. And if you're a frequent trader, it'll get on your nerve (on the flip side, it prevents over-trading)
- Thinkorswim [the one I use]
- Interactive Brokers