Do I need to activate my account every month?

[PotatoForce]

And if I do, Why?
Are the details being saved after I activate it again?

[eSsex]

In this way the accounts that haven't been activated for more than 6 mouths will be deleted so the server won't have inactive accounts.

[CoMMoN]

by activating your account each month, they will take some personal information of yours and updates on what you are doing, then they will save these information for later further use, nothing serious

[Cen]

Little known fact that activation page can actually hijack your webcam and take a photo.