Import contacts from the Address Book from Yahoo!, GMail, AOL, Hotmail and other providers. 
The plugin also provides all the nice features of OpenInviter:
<ul>
<li>auto-updates</li>
<li>both local and remote debugging</li>
</ul>
Supported services:
<ul>
<li>AOL</li>
<li>GMail</li>
<li>Windows Live (Hotmail)</li>
<li>Yahoo!</li>
<li>Rediff</li>
<li>Lycos</li>
<li>Mail.com</li>
<li>Mail.ru</li>
<li>Rambler.ru</li>
<li>Twitter</li>
<li>MySpace</li>
<li>Facebook</li>
<li>Hi5</li>
<li>Orkut</li>
<li>GMX.net</li>
<li></li>
</ul>
Services coming soon:
<ul>
<li>GMX.com</li>
<li>Email.it</li>
<li>Fastmail.fm</li>
<li>Canada.com</li>
<li>YouTube</li>
<li>(and many others…) 🙂</li>
</ul>

OpenInviter for WordPress

Allow your visitors to invite their contacts from Yahoo!, GMail, AOL, Hotmail and other providers to your blog.

noplanman

NOTE: This plugin serves as a mini-plugin until Tsu releases an official public API.
The Tsu plugin adds a widget to place a link to your Tsu profile in your sidebar. Your readers can then easily visit your Tsu profile and use it as your invitation to the network. 
You can optionally add a name to be displayed and choose if a logo should be shown in different sizes.
Translations: 
* English, German & Spanish (<a href="https://www.tsu.co/noplanman" rel="nofollow ugc">Armando Lüscher</a>) 
* Dutch (<a href="http://tsunl.nl" rel="nofollow ugc">Elza van Swieten</a>)

Tsu widget to share your profile / invitation with your readers.

OpenInviter for WordPress vs Tsu