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THE PIONEERS www.facebook.com Most popular www.friendster.com (defunct) www.myspace.com Became a music site www.tagworld.com Personalize content www.tagged.com Teen groups GENERAL PURPOSE www.cyworld.com South Korea www.hi5.com Global reach www.ning.com Create own network www.orkut.com Communities www.vk.com Russia & environs www.xanga.com Popular with teens SPECIALIZED www.asmallworld.net Invitation only www.bebo.com Students, U.K. www.classmates.com Students, military www.geni.com Genealogy tracking www.librarything.com Online book club www.pinterest.com Photo sharing www.reunion.com Find classmates BUSINESS www.adgabber.com Marketing www.linkedin.com People networking www.ryze.com People networking www.sermo.com Licensed doctors www.spoke.com Find people www.xing.com People networking MOBILE ORINETED www.gab.com Short messages www.parler.com Short messages www.share.ovi.com Media sharing www.x.com (Twitter) Short messages