Forty hour workweeks are a relic of the Industrial Age. Knowledge workers function like athletes - train and sprint, then rest and reassess.
1/ If the primary purpose of school was education, the Internet should obsolete it. But school is mainly about credentialing.
Twitter is the only social network that connects people over ideas rather than over pre-existing relationships.
Networking is overrated. Become first and foremost a person of value and the network will be available whenever you need it.