A continuación comparto con vosotros una série de URLs customizables para compartir contenido:

<b>twitter:</b> http://twitter.com/home?status=[TITLE]+[URL]<br><br>
<b>facebook:</b> http://www.facebook.com/share.php?u=[URL]&title=[TITLE]<br><br>
<b>Tumblr:</b> http://www.tumblr.com/share?v=3&u=[URL]&t=[TITLE]<br><br>
<b>Digg:</b> http://www.digg.com/submit?phase=2&url=[URL]&title=[TITLE]<br><br>
<b>StumpleUpon:</b> http://www.stumbleupon.com/submit?url=[URL]&title=[TITLE]<br><br>
<b>Delicious:</b> http://del.icio.us/post?url=[URL]&title=[TITLE]]&notes=[DESCRIPTION]<br><br>
<b>Google Buzz:</b> http://www.google.com/reader/link?title=[TITLE]&url=[URL]<br><br>
<b>Google Bookmarks:</b> http://www.google.com/bookmarks/mark?op=edit&bkmk=[URL]&title=[title]&annotation=[DESCRIPTION]<br><br>
<b>Linkedin:</b> http://www.linkedin.com/shareArticle?mini=true&url=[URL]&title=[TITLE]&source=[SOURCE/DOMAIN]<br><br>
<b>Slashdot:</b> http://slashdot.org/bookmark.pl?url=[URL]&title=[TITLE]<br><br>
<b>Technorati:</b> http://technorati.com/faves?add=[URL]&title=[TITLE]<br><br>
<b>Posterous:</b> http://posterous.com/share?linkto=[URL]<br><br>
<b>Reddit:</b> http://www.reddit.com/submit?url=[URL]&title=[TITLE]<br><br>
<b>Newsvine:</b> http://www.newsvine.com/_tools/seed&save?u=[URL]&h=[TITLE]<br><br>
<b>Ping.fm:</b> http://ping.fm/ref/?link=[URL]&title=[TITLE]&body=[DESCRIPTION]<br><br>
<b>Evernote:</b> http://www.evernote.com/clip.action?url=[URL]&title=[TITLE]<br><br>
<b>friendfeed:</b> http://www.friendfeed.com/share?url=[URL]&title=[TITLE]

Evidentemente tendréis que substituir [TITLE], [DESCRIPTION] y [URL] por los datos correspondientes (ya sean literales o códigos PHP).