If you want to talk about a publicly-traded company on Twitter, here’s a bit of shorthand you should try out. Put a dollar sign ahead of the company’s stock ticker symbol. So if you’re grumbling about Google, the appropriate tag would be $GOOG. Musing about Microsoft? Try $MSFT. Angry at $AAPL? You get the idea. […] If you want to talk about a publicly-traded company on Twitter, here's a bit of sh