Michael Henke

Insert SEO friendly/neutral links to social networks and bookmarking services. This plugin is proudly provided by <a href="http://www.all-things-seo.com" rel="nofollow ugc">all-things-seo.com</a>.
If you don’t know yet, find out what a <a href="http://www.all-things-seo.com/seo/seo-friendly-social-links/" rel="nofollow ugc">SEO friendly link</a> is. These Links can be inserted automatically above or below each post or manually (e.g. in the theme).
The plugin ships with support for Twitter, Facebook, digg, delicious, buzz, reddit, StumbleUpon, …extend the list by customizing your own services

SEO Friendly Social Links

Insert SEO friendly/neutral links to social networks and bookmarking services.

LaClave

The MasDetalles share plugin to help people share, bookmark, and email your posts and pages using Masdetalles share. New: MasDetalles share.
MasDetalles Share le permite compartir sus enlaces en el marcador social Masdetalles.do desde su blog, email, tienda virtual, y cualquier pagina web.

Masdetalles Share

Help people share, bookmark, and email your posts, pages, your favorite links through MasDetalles.do

SEO Friendly Social Links vs Masdetalles Share