有沒有辦法可知道誰看我FB, MSN PROFILE 呢?

Facebook is NOT secured. If you don't want people other than your friends to see your profile, you need to go to Privacy setting & restrict them.

Same thing for MSN.

These are FREE, For-Profit services that is not safe.

Don't put any Personal information up if you don't want to be seen.

You can't see them if they are invisible.