Facebook's user base is dominated by 25+, but they still have 50+ million user under the age 25. Facebook is a great place to start social media marketing, because your audience will generally lie within one of their age demographics. - See more at: http://jetscram.com/blog/industry-news/social-media-user-statistics-and-age-demographics-2014/#sthash.oVLFobMg.xBw05u53.dpuf