Went and enjoyed a few beers with a friend who's business is all about bloggs.....

http://www.x2o.com.au/index.php?option=com_content&task=view&id=14&Itemid=41

He does a coffee review and also sets up groups of people who then paste thier blogs from the meeting, these meeting can consist of many people with shared interests.

So the reason for the cofee review is that it is a somewhat lucritive market to involve the coffee shops (http://www.melbournecoffeereview.com/) to have these meetings, interesting.

So I suppose people are using blogs to share ideas of common interest meetings.