I'm on a Motorola 3G / Android/Verizon phone. Occasionally I open the "task manager" app to find that several tasks are running that I didn't even start (for example facebook, settings for mmy phone), and often some tasks that I've never used, and never plan to use (like corporate calendar, voice search, etc).

So I click "kill tasks" which closes them down and removes them from the list of of things that are running. Then a little while later I go back to check, and many tasks are running again that I didn't start! What is this about? Is it big brother somewhere hacking into my phone? Does this happen to everyone?