What is the point of phishing peoples facebooks, myspaces, etc...?

I don't understand why someone would want to just post random pointless comments on peoples walls and in-boxes. Does anyone know why people do this?What is the point of phishing peoples facebooks, myspaces, etc...?
Because too many people will use the exact same password for everything they do on the internet.



If someone can successfully "phish" someone's MySpace password, the chances are good that the phisher now has access to e mail and maybe even financial information.



Let's be honest, the typical MySpace user is not exactly the most computer literate person on earth.What is the point of phishing peoples facebooks, myspaces, etc...?
They can also view your inbox and outbox, and if you send any sensitive information via those, they will be able to use them - such as addresses, credit card numbers, and phone numbers.