Fast is the easiest way to login.
The Fast button can be easily added to any website for secure one-click login for all users.
Fast supports 100% of users, authenticating through email, and doesn’t require users to have a Fast account.
PS: They release Wordpress plugin soon and I've asked to add Telegram login feature as a request.
It'd be great if someone found great to release it on Zoho Marketplace as Desk Login Connector.