That kind of thing has been going on long before there were any blogs and will continue as long as just about any person can create something and make it available for the world to see.
I saw a lot of useless websites in the early days of the Web and there are still web sites that don't look as if they have any purpose. The same is true for blogs.
When you have millions of people producing millions upon millions of sites and blogs, this type of thing is only natural.
You have people from young children all the way up to the elderly creating something and putting it online. Some have something worthwhile and many don't.
The example you have linked to is a masterpiece compared to some of what is out there.
A while back I started a thread about a site that offers very little. It is however fun to some people and funny to others. Then there are many who would wonder why a person would take time to come up with something such as this. Here is a link to it in order for you and others to draw their own conclusions
This is fun and funny