With increase in usage of the Internet, there has been an exponential increase in the use of online social media on the Internet. Websites like Facebook, YouTube, Orkut, Twitter and Flickr have changed the way Internet is being used. There is a dire need to investigate study and characterize privacy and security of online social media from various perspectives (computational, cultural, and psychological). Real world scalable systems need to be built to detect and defend security and privacy issues on online social media. The main goals of the talk are to highlight and discuss latest issues, trends, and cutting-edge research approaches in security and privacy in online social media.