When a new medium is presented, especially one with lots of access, people try lots of new things on it, some succeed and some fail. People pick up on trends and fads and tend to follow them, so those things become the thing you're more apt to see if you pick at random. Those trends evolve over time. If you're looking around you can find the 'different' thing that will become the new trend, and many more things that will die off.
When a new medium is presented, especially one with lots of access, people try lots of new things on it, some succeed and some fail. People pick up on trends and fads and tend to follow them, so those things become the thing you're more apt to see if you pick at random. Those trends evolve over time. If you're looking around you can find the 'different' thing that will become the new trend, and many more things that will die off.