Twitter eats the world of news media with 140 characters. Vine becomes the serious video entertainment. Dribbble dominates the design portfolios. Snapchat brings limits in the video view time and becomes a serious threat for Facebook. What do all have in common? Constraints on the content generation and consumption.

It would sound like counter intuitive if we heart it five to ten years ago: constraints make more use of the product. Andrew Chen asks it as a "Why would it make a product more successful by forcing constraints on content creation? Isn’t more always better? Wouldn’t each of these products be better off by removing the constraints? And does every constraint work, or is it all arbitrary?"

Modest convenient products outperform shiny complicated by significant margins. But does that mean we have to keep the design simple? Theoretically no. But we have to admit that the best practices has the low entry barrier.