The Electronic Frontier Foundation (EFF) and UC Berkeley Samuelson Clinic has documents that outline the use of social media by government agencies in investigations from the Internal Revenue Service and Department of Justice Criminal Division. These documents are being released through a Freedom of Information Act (FOIA) case the organizations had filed jointly.
Read the post by the EFF on the documents and future release of records.
In the released documents is a training manual from the IRS (PDF) on how to use social media and Google maps to investigate tax cases. Also under the FOIA case, the Justice Department released a presentation entitled "Obtaining and Using Evidence from Social Networking Sites."...