Mandy's Mashups provides a number of resources on social media. However, my most up-to-date resources are my blogs. Rather than have one blog to try and cover everything I have created several blogs to cover several different topics. I encourage you to explore all of them and let me know if you have any suggestions for topics, content, etc.
Social Media Blog This blog offers information on social media particularly related to international education and international travel.
Apps for International Travel This blog provides reviews by students and fellow travelers on apps they used while traveling abroad. It is a great resource if you are looking for apps to use to help you stay connected and get around when traveling.