Rather than attempting to put every single social bookmarking site link in your MediaWiki skin template, there is a simpler way. We can use a social bookmark aggregator such as eKstreme's Socializer, or AddThis.
AddThis (http://addthis.com) is the "number one bookmarking and sharing button".
Linking to AddThis is easy as there is a wizard-style, step-by-step guide for creating and customizing your button. AddThis gives you a number of choices as to how it looks and acts for your wiki's visitors. Firstly, it can be used as a single button:
Secondly, a "drop-down" version with JavaScript can be used, which provides an instant access to the more popular bookmarking services:
ekStreme's Socializer (http://ekstreme.com/socializer) is another social bookmark service aggregator.
Unlike AddThis, Socializer does not have a...