Facebook is, by far, the world’s most popular social network. A listing which circulated recently showed a comparison of social media network populations against the populations of real world nations. There’s no question of Facebook’s dominance, no doubt about the influence the social giant has, given it’s place in the modern communications landscape. And number of Facebook's popularity ,there’s no way marketers are going to ignore it,they have turned their attention to setting up shop on Facebook. With the ability to interact with, target and market to people who are in a place prepared to be social. though the decision to reduce brand reach has definitely caused a change in thinking - if for every hundred ‘Likes’ you gain, you’ll only be reaching ten of those people, at most, the next time you post an update, the return on investment gets pretty cloudy.