BUT, after I find out the account is not under my control anymore, I tell my friend but he said he don't know. Tell me, is that you my friend? If so, why you don't tell me before?
Edit: If you are really my friend, tell me the initial letter of city our university.
I am not sure if the signature campaign was a big thing back then. I have seen some old signature campaign threads where people earned a big amount of Bitcoin monthly. But, since Bitcoin price was too low back then. probably it was not much. If the account creator decides not to share the password with you anymore, it is understandable why they said they do not know about it.
@Falconer: why did you delete the messages posted by OP?
Since both person has control of this account, if one of them do not want to share the account anymore, they may delete whatever was posted by their friends. I guess it's a common thing someone will do. If I share a account with my best friend but later decide not to share it anymore, I may delete the posts he made with my account.