How many of these top 15 social media sites are you on, or even heard of:* Facebook 750 million estimated monthly unique visitors* Twitter 250 million "* LinkedIn 110 million "* MySpace 70.5 million "* Google Plus+ 65 million "* Deviant Art 25.5 million "* Live Journal 20.5 million "* Tagged 19.5 million "* Orkut 17.5 million "* CafeMom 12.5 million "* Ning 12 million "* Meetup 7.5 million "* myLife 5.4million "* myYearbook 3 million "* Badoo 2.5 million "Spend some time on www.ebizmba.com and check out their lists. You will also find (as of April, 2012) the top 15 most popular "gadget" sites, which might be worth being on if you sell kitchen, electronic or other gadgets.They are:* Engadget 11.5 million estimated monthly unique visitors* Gizmodo 8.9 million "* Tom's Hardware 4.3 million "* Crave 2.9 million "* Digital Trends 900 thousand "* The Verge 800 thousand "* Slash Gear 550 thousand "* BGR 530 thousand "* DVICE 450 thousand "* UberGizmo 350 thousand "* TechEBlog 300 thousand "* Coolest Gadgets 250 thousand "* Geeky Gadgets 230 thousand "* Electronista 185 thousand "* Walyou 115 thousand "While you're exploring these social networking sites, check to see if your competitors are present. If they are, you probably need to be there. If they are not, it represents an opportunity to be there first.Social networking sites have exploded rapidly in recent years, and are neck-in-neck with search in terms of consumer traffic. They can't be ignored any longer.With the huge amount of traffic many of these sites have, and their ability to target advertising and give your company pages exposure, you'd be wise to spend the time to evaluate the sites that might be appropriate for your products or services.Your presence on social media networks should reflect your commercial and web page, so that the product, offer and price are all consistent. In addition to a company page, check out what competitors are doing on these sites to learn other ways you can take advantage of the huge audiences that regularly spend time on these sites.Finally, there is a tremendous amount of free information about developing your social network presence, which you can find by Googling words like social networks, social media, etc.You can download the entire ebook at any time at: http://DD111.acquirgy.netIrv Brechner has written over 100 published direct marketing articles and 13 books on a variety of topics. He's been a pioneer in online customer acquisition since 1996 and offline for his 35-year career. He has developed Acquirgy.com's "Customer Acquisition Intel Center" (acquirgy.com/intel ) he evangelizes best-of-breed tactics to help companies acquire customers in the digital age. He can be reached at: email@example.com .Read all Irv's MediaBizBloggers commentaries at Customer Acquisition Intel.Check us out on Facebook at MediaBizBloggers.comFollow our Twitter updates @MediaBizBloggerThe opinions and points of view expressed in this commentary are exclusively the views of the author and do not necessarily represent the views of MediaBizBloggers.com management or associated bloggers. MediaBizBloggers is an open thought leadership platform and readers may share their comments and opinions in response to all commentaries.