This posting is mostly to serve as a reminder to myself, but others may find the details useful. The Drupal content management system has a ton of modules that can be installed to enhance a website. One of the modules that is used on most every Drupal based website I run is "Service Links". It is what allows the icons to appear the bottom of a post to allow people (including the blog writers) to link to blog entries on various social networking sites. For example, the Twitter icon will open a new window to allow you to tweet about the blog entry and provide a link to it. This can be useful for sites who get a large number of their visitors through their users or themselves using these links to advertise and promote the blog entry.
The Service Links module includes a long list of social networking sites built in, including: Twitter, Facebook, LinkedIn, Digg, Reddit and a ton more. One service it doesn't have built in is Tumblr. However, the module can be fairly easily edited (if you know what to do) to add more sites including Tumblr. The module creator posted the code for adding Tumblr to the Service Links module, but didn't include any details on how to manually add the code. Since future updates to the module might remove the manual addition, in this post I'm going to document how to add Tumblr to the possible links. Read more »