Matheus Eduardo

This plugin adds a new field (metadata) in the section editing links in order to add social networking links (like <a href="http://twitter.com/" rel="nofollow ugc">twitter</a>, <a href="http://flickr.com/" rel="nofollow ugc">flickr</a>, etc.) to any link.
PT-BR 
Este plugin acrescenta um novo campo (metadados) na seção de edição de links para poder adicionars links de redes sociais (como <a href="http://twitter.com/" rel="nofollow ugc">twitter</a>, <a href="http://flickr.com/" rel="nofollow ugc">flickr</a>, etc) a um link qualquer.

Simply Social Links

This plugin adds a new field (metadata) in the section editing links in order to add social networking links (like twitter, flickr, etc.) to any link.

feedmeastraycat

WordPress removes the Update Services ability (Settings – Writing) when you create a network (aka enables WordPress MU/Multisite). 
Activate this plugin to get it back.
Note: This is only for WordPress setups with a network, aka multiple sites, aka multisites, 
aka WPMU in WordPress 3 and later.
This plugin might work with older WordPress MU sites. I haven’t tested it though. If you do, please 
let me know how it turned out.
<h3>Files</h3>
<ul>
<li>/activate-update-services/activate-update-services.php</li>
<li>/activate-update-services/README.txt</li>
</ul>

Activate Update Services

WordPress removes the Update Services ability when you create a network. Activate this plugin to get it back.

Simply Social Links vs Activate Update Services