The long tail theory can be used in terms of measuring different social networking sites, here is a analysis of 29 social networks that record a million or more visitors per day.
Facebook leads the chart with 310 million visitors everyday followed by Google’s Orkut with 51 million. It has to be noted that Friendster has not even made the listing or that MySpace has slumped to 12th place.
More interestingly Facebook leads all other social networks by a mile, even if all the other 28 social networking site visitors are put together they make up for only 2/3 of Facebook’s numbers! More on the chart below: