Privacy is very important.
If an account is created only username and password are required.
The E-Mail adress is not required. The E-Mail adress has to be verified to get information about polls.
The userdata will not be given away or analysed in any way.
All userdata can be deleted any time. The data will not only be marked as deleted, they will be physically deleted from the database.
The existing stats will only count the number of poll related data to see the usage.
All relevant data is also stored in encrypted form in the database.
More information can be found here:
Data privacy