AdiInviter Pro!

AddThis is a free way to boost traffic back to your site by making it easier for visitors to share your content.

Share buttons by AddToAny, the universal sharing platform for websites and apps.

Shareaholic is the simplest way to share, spread, and save interesting webpages via your social networks, email, blogs, IM, and more.

A service that let you share addresses to web pages etc on most of the common used social networks and sites.

Grow your business by allowing your users to import their contacts

OpenInviter is a free import contacts (addressbook) script from email providers like Mail2World, Azet, Mail.in, Uk2, Mynet.com, Clevergo, Aussiemail, Pochta, Nz11, Apropo, O2, AOL, KataMail, Canoe, Bigstring, Wp.pt, Freemail, Yahoo!, FastMail, Bordermail, OperaMail, Walla, 5Fm, Popstarmail, Mail.ru, Atlas, Inbox.com, Doramail, Care2, Techemail, Interia, IndiaTimes, LinkedIn, Yandex, YouTube, Meta, Libero, Live/Hotmail, Inet, Web.de, Abv, Hushmail, Xing, GMail, Rediff, Terra, Lycos, India, Sapo.pt, Zapakmail, Plaxo, Mail.com, Netaddress, GMX.net, Kids, Virgilio, Grafitti, Rambler, Evite, Gawab, MSN or social portals like Multiply, Faces, Bookcrossing, Livejournal, Eons, Meinvz, Xanga, Bebo, Brazencareerist, Xuqa, Flickr, Lovento, Mevio, Plazes, Plurk, Twitter, Vkontakte, Koolro, Konnects, Motortopia, Ning, Skyrock, Flingr, MySpace, NetLog, Perfspot, Kincafe, Friendfeed, Facebook, Famiva, Friendster, Badoo, Last.fm, Orkut, Tagged, Flixster, Vimeo, Cyworld, Mydogspace, Hi5, Mycatspace, Fdcareer, Hyves. This contacts importer script is integrating with content management systems (aka CMS) like Etano, symfony, Wordpress, Vwebmail, PHPMELODY, Joomla, jamit job, Joomla1.0, vBulletin, Buddy Zone, Atmail5, joovili, Dating Pro, PunBB, Boonex Dolphin, SimpleMachines Forum (SMF), myBB, phpizabi, E107, Social Engine, phpFoX, JamRoom, Drupal, Social Engine 4, RoundCube, PhpBB, nowFire. Open Inviter is written in PHP 5 (no database required but cURL or wget required) and running on any webserver (tested on Apache) offering advanced tell a friend features. OpenInviter is a free self hosted solution that does not use a third party gateway (or API) to import contacts. »

CloudSponge provides an interface to easily enable your users to import contacts from a variety of the most popular webmail services including Yahoo, Gmail, AOL, WindowsLive/MSN/Outlook.com, Linkedin as well as popular desktop address books such as Mac Address Book and Outlook.

Super Tell A Friend is a powerful script that lets you implement word of mouth marketing campaigns directly on your website.

Launch Customer Referral Program Contest or Marketing campaign using Invitereferrals, Simplest referral marketing software,Increase Sales, traffic by Software.

Janrain provides hosted user management solutions for social login and sharing, single sign-on and social profile storage.

InviteBox makes it breathtakingly easy to add a state of the art referral program to your website. With just a few clicks your users will be able to share your product or service with their social network peers or webmail contacts. And the powerful incentive system featuring instant rewards will help you make sure that you are making the most of word of mouth.

Implement your social media contests and increase website traffic!

HybridAuth A PHP Library for authentication through Facebook, Twitter, Google, Yahoo, MySpace, LinkedIn, AOL, Vimeo, FourSquare, OpenID and other Identity providers