You may have encountered the interesting little list of blog links at the bottom of someone elses' blog and thought to yourself "that's cool...how do I do it?"
Quite simply, the Add This! API is all you need...and here are the details you need to do it: http://www.addthis.com/help/api-spec.
There are other options too, such as http://www.addtoany.com/buttons/.
Implications for spot learning include the opportunity to help content go viral.
One more tip: If you're just getting started with a brand, you may want to use NameChk to verify if your brand name is already taken in the most viable social networks.