Twitter - How can I message with a large group of people, and also receive alerts from people I'm interested in?
Facebook - How do I keep in touch with my friends easily?
Skype - How can I call cheaply?
Games - How do I waste my time?
Pintrest - How do collect snapshots of things I'm interested in?
EDIT: Admittedly games are the most vague when you try to define the problem.
Twitter - How can I message with a large group of people, and also receive alerts from people I'm interested in? Facebook - How do I keep in touch with my friends easily? Skype - How can I call cheaply? Games - How do I waste my time? Pintrest - How do collect snapshots of things I'm interested in?
EDIT: Admittedly games are the most vague when you try to define the problem.