After open sourcing their services code, GitHub experienced a surge in pull requests that introduced a wide array of new functionalities, expanding their initial service hooks from just Campfire and Lighthouse to include Basecamp, CIA.vc, IRC, Email, FogBugz, Jabber, and Twitter. Users can configure these services by accessing the 'Service Hooks' option under the 'Admin' tab for their repositories. The contribution of numerous individuals, including Blake Mizerany, Brandon Keepers, and others, was acknowledged by PJ Hyett, reflecting the collaborative effort that has significantly enhanced GitHub's service offerings.