Facebook has recently launched Facebook Studio, a site dedicated to showcase advertising campaigns that utilize Facebook as the central mean to reach consumers. I think this site is a great resource to gain knowledge on other successful campaigns and help spark inspiration and creative ideas for new ad campaigns that look to utilize social media. The idea behind the Studio is not to show companies how to use Facebook to drive awareness and sales, but to simply showcase other successful campaigns, what type of success the campaign had received, and give credit to the agencies who have developed the campaign.
For further resources on working with the Facebook platform, see the Facebook Learning Lab