We use Google Accounts to control access to A2X because Google's security is excellent and most users already have a Google account. Google accounts offer a number of important features for modern web applications: strong password protection, 2-factor authentication, multiple-account management.
Anyone can create a Google account using either a free @gmail.com email address, or their firstname.lastname@example.org email address.
Nothing personal about your Google account is available to A2X or shared. Only your email address is used by A2X - and we promise we won't send you any spam!
Very. Google themselves claim: "Your Google Account is protected by the most advanced online security". You should use a strong unique password, and enable 2-factor authentication for maximum security.