I just bumped into this web site and think the information there can be useful for BH SEO work. Code: useragentstring.com We use a variety of disguises to conceal our account creations, the most popular (or required) are different IP addresses. But even so, we can end up with accounts that are all named "SusieJamison2182, "SusieJansen8315," "SusieJohnson3975," all created within ten minutes of each other and all with a browser user agent "Mozilla/5.0 (Windows; U; Windows NT 6.0; ru; rv:1.9.2) Gecko/20100115 Firefox/3.6". We look for ways to mash up the accounts differently. There are utilities that provide a very limited set of additional user agent strings But the database at useragentstring probably includes thousands of different valid user agent strings that let you accurately:change your reported hardware change your reported OS change your reported browser change your reported version change your reported model change your reported language Being able to provide a massive number of different valid user agent strings certainly doesn't improve our security by 100% or perhaps even 10%. But every little bit helps, particularly when it's free. And the little bits add up.