To become mainstream: integrate your product on existing tools

When designing a new service on the Internet, the goal of an entrepreneur is to become mainstream. That means they want their service to be used by everyone.
Now let's consider the new services that became mainstream after Facebook. The main names would be Twitter, Foursquare, Instagram, Angry Birds... The common factor that made these service become so popular is the fact that they were really easy to use. Actually they didn't change our old habits. They integrated on existing platforms. Therefore the barrier to use it everyday wasn't huge.

Uber redefines urban transportation in Paris

If you ever tried to travel by cab in Paris, you're probably aware that the French capital doesn't have enough taxis compared to the need. On the other hand, there are companies that let people hire a car with driver for a couple of days. These drivers usually have some spare time they would be happy to monetize.

Uber will efficiently connect people who need a ride with these drivers. The experience provided is just outstanding. They just launched their offer in Paris. I've tested it.