Wrapper around Facebook's mobile website and APIs.

It is lightweight: it weighs less than 100 Kb
It has simple, modern design: there is only what you need
It is Open source: the code of this app is online on GitHub, anyone can verify the authenticity of the app and contribute to its development.
It is free and without ads
it is not intrusive
It respect your privacy: this app doesn't require special permits. Without consensus Facebook can not access to any data of your mobile phone

SlimSocial for Facebook