Collecting information through blogging is central to every blog. Businesses are starting to pick up on this. Take a look at this blog by a Dutch Lawyer, for example. The use of discussion boards is also very popular, like for example the rechtenforum. It's not just citizens, but also some lawyers participating on these public discussion boards.
Blogging and participating in public discussion boards is very usefull for bussinesses, others still prefer using social media safely behind company walls, through services like yammer.
Finding relevant discussions is hard work. Trying is the best you can do as a starter.