Sites and useful tools must be addicted to it more than social networks

Hack a Day

Good location for owners of innovation and creativity in e-projects and Alrespery and Alardino and programs as well, which can work at home using simple tools, and the idea is to bring creative projects and new tricks competent hardware and programming a day, and the plain meaning of hack is the maximum benefit and deep knowledge of something, site contains many of the projects are competent (Android, Ardino, Respery, Xbox, Google ...).

Howstuffworks

 
If you're interested in how things work and they want to have this wonderful site, where you Howstuffworks offers detailed explanations and simplified how things work, the site covers almost all areas of technical, scientific and entertaining as well.

Reddit

43things

Community morbid Algius sense of the word, spin it debates and things are very useful in most areas, characterized Reddit simply designed and popularity among programmers and gamers and entertainment, and you can also take advantage of the sections as sel-development to evolve from yourself and find out new methods in learning and life.