If you had only 160 characters to introduce yourself, what words would do you pick?
Would any of these words be a brand name?
I've looked at how people associate themselves with brands in their Twitter bios using a nifty Google query ("bio * keyword" site:twitter.com). And chances are that if your tiny blurb includes a brand name, you either sell it, work for it, or really, really like it.
On Twitter, people like Apple. Lots of "apple fans", but no "IBM fans". And yes, there are "Microsoft fans". Eight of them.
Microsoft, people work for.
Mazda, and Chrysler, and Toyota, they sell.
Once you omit duplicate results, fewer than a hundred people have Walmart in their bio. Even fewer have Versace. But that probably isn't surprising.