Well at least it wasnt your account that got taken away...
NEVER EVER EVER EVER EVER EVER EVER EVER EVER give your password to ANYONE ELSE. Trust me, WORD SPREADS. Ive never known how and probably never will but its amazing how I watch my friends tell each other their passwords... word spreads very quickly and by the time we get home from school *ring ring* (telephone) "Omg! Ive been hacked!"
atm I am the best RS Player at my school... Apart from my friend whose Mum is faaaaaaaaaaaaaaar better than me (in total lvl) and she only started playing about a year ago. Everyone asks me for my password and they just cant stop nagging me to give them stuff.

But Im happy to say that I love my account so much I have never given away my password to anyone. Occasionally I let my (most trustworthy) friends borrow a rune hally or something when we kill Hellhounds together but they always give it back straight after.
And also NEVER Download anything suspicous or from any kind of third party. If you do, and you want to make sure it wont steal your password or something like that, test it on an account you dont need, dont care about, or anything like that. But Im not saying you should because Jagex has stated many times that it is an offence to the game.
And as Enkid said, a secret sentence or something would really help too.
