While there are hundreds, if not thousands, of social media sites out there, it’s impossible to use them all. Generally, it’s more effective to use a small number (I recommend 2 to 5) actively, and if you want to have accounts at other sites that you use ocassionally, that’s fine. Because part of being a successful social media user involves building a profile and a reputation at the site, it is much more realistic to achieve this when you’re using a small number of sites consistently. (See our categorized list of social media sites.)