This site did not show evidence of storing passwords in plaintext.
This site does allow secured connections (https)
This site did show a clear way to unsubscribe from their emails
This site does verify your email address.
Below is a sample of the emails you can expect to receive when signed up to BTCClicks.
Please verify your email account by clicking the following button.
Copy and paste this link into your address bar if the above button does not work or you cannot see it or click it. https://btcclicks.com/continue_signup?h=a49bf9b8dc325f9f8a7fd328b8887d48780a87683c31098a67ebf893b25e5644