Added classes to the link markup based on social media site. Twitter will get 'class="twitter_smsc"' and so on. Added optional target parameter to shortcode in case someone wants to open in different browser windows.
Added is_array() check after filter and some function documentation.
Added filter for users to add their own sites.
Requires: 3.0 or higher Compatible up to: 3.4.2 Last Updated: 2013-1-12 Downloads: 2,454