Mark (podz)

Make your website go viral by allowing users to spread the word!
This plugin gives your readers the ability to spread the word about your website simply by entering the e-mail addresses of their friends. The system will then send e-mails to these people to allow the word to be spread. You’ll soon be getting more visitors than ever before!

The Viral Widget

Make your website go viral by allowing users to spread the word!

Steven Word

Automatically create and accept friendships for specified users upon new user registration. * Requires BuddyPress

BuddyPress Automatic Friends

Automatically create and accept friendships for specified users upon new user registration. * Requires BuddyPress

The Viral Widget vs BuddyPress Automatic Friends