Hooked - How to build habit forming products [30%]
Chapter 3: Action
Twitter went through many iterations of landing page design. Leaning towards simple. In the end they only had two actions available, sign in and sign up.
A year later they removed the image and instead added the message to Download the app. Sign in and sign up stayed there. That combo drove the most users and most repeating actions.
On heuristics and Perception
The mental shortcuts that people take (heuristics) if used correctly can dramatically increase the rate at which people use your service. The four main heuristics are:
The Scarcity Effect People judge same things differently depending on the amount of that thing.