The traditional business directory industry's 'little secret' is that even in the biggest directories, up to 15% of records are out of date, incorrect or wrongly classified. The main aim of the founders of Brownbook was to make it dead simple for people to correct things when they spot problems (something very hard to do in most traditional directories) - hence the introduction of wiki-like principles in Brownbook.
The beauty of it is that, if you find that your own business (or anyone else's) is inaccurate in any way, you can simply correct it yourself - or report it for deletion if it's, say, a duplicate or if the business no longer exists. This is a fine example of crowdsourcing in action!
In this way, Brownbook- the free global business directory anyone can edit - is made more accurate every day.