Anyone can post messages to the net. Practically everyone does. The resulting cacophony drowns out serious discussion.
It's a great medium for trivia and hobbies, but not the place for reasoned, reflective judgment. Suprisingly often, discussions degenerate into acrimony, insults and flames.
The Internet has no such organization - files are made available at random locations. To search through this chaos, we need smart tools, programs that find resources for us.