After seeing this video, I think you must agree Friendster, Facebook, myspace or hi5 is not as secure as you think.
The hacker who is a Malay at 22 of age has show us how he had view the private profile photos without the user permission. He can view the comments that your friend leave for you in friendster. He even can open an inbox of another user with Visual Basic.
Although the hacking is not easy but it is not too hard and I think many programmer has no problem to hack Friendster. So beware, don't leave so many secret in your Friendster or any other social network.