How can I add social Media Buttons (Facebook, Twitter & Co.) to jQuery colorbox?

The aim is to display social media buttons on each image in the jQuery colorbox view. As displaying something other than text in the lightbox is not possible by default (<a href="">jQuery colorbox</a>) (see documentation, demo), we need a custom solution to do the job. Note: As jQuery colorbox is a Plugin for certain content management systems, it is important that the change should be done WITHOUT changing the code of the lightbox and WITHOUT accessing the HTML directly, as Plugins for CMS should not be modified as they will loose update compatibility. The result should look like in attachment 1 (sample.png).
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