The Document Foundation runs ads on a temporary basis on Facebook and on Google through its specific Google AdWords Programme.
More information may be found in this thread.
Facebook Ad Campaign
More information can be found inthis thread. Specifically the first ad that was launched (early May 2013) and was meant to run over a month. Its purpose is to raise awareness of LibreOffice and generate page likes (people liking the LibreOffice Facebook Page).
- An interim report is available as a csv file and sanitized under ODF. The file is available here.
- Below is a set of the final repor documents. They list various metrics depending on specific aspects (demographics, click rates, etc):