it looks like that in lunatics it has been really very bad with nearly everything, as per info in the forum. 
I still don't understand why this kind of people is granted with and Internet access 
Not only people and they get payed to do this, but a lot of automated systems as well.
Lots of free unlimited email accounts.

They place links, more often they add a signature, with advertising links.
The way Search engines like Google work. The more relevant the site the link is on, the higher on the search results and that's worth money.
And of course, there are a lot of lunatics around, who just want to post random messages....