In general sharing passwords to a third party website is a red flag. HN may blacklist your servers for security. In general social networks like Facebook, Twitt

In general sharing passwords to a third party website is a red flag. HN may blacklist your servers for security. In general social networks like Facebook, Twitter, reddit, Github, LinkedIn,etc use Oauth2 for better security. But you may have more chance if you build an open-source desktop app, using electron if you want to use web technologies.