It's important to notice trends. The more you watch the easier it gets. Look long enough and you might even pick the winners.
- It's simple - users need only point and click on things they like;
- It focuses on the user - what they like - no interruptions; and,
- There's no barrier to entry - login to your fave social network and get started.
Most important - stuff we enjoy is worth talking about...like it or not.