Using the Social Networking Links Ad-don you will be able to access famous social networking sites login page from your browser menu. The Addon will appear on the menu as title "SocialNetwork Links" and you can access it using keyboard shortcuts Alt+c, and using multiple combinations like "Alt+c+g" you can access "Google+" account, using "Alt+c+f"(enter if required) you can open facebook, and so forth. This addon is very useful to people who do most communication in different social networking websites if there bookmarks are not available. This can be used as a alternative to Bookmarks for Social networking websites.
You can also email me to firstname.lastname@example.org if you wish me to add your famous social networking links, and I will surely add best among those to the add-on as a update.