If you want some indication of the size of the Internet, the number of registered domain names is a good place to start. VeriSign, who help manage the Internet's root DNS servers, reported in the latest Domain Name Industry Brief that over 209.8 million domain names have now been registered. What is more, the number of domain names being registered is increasing year on year; The first quarter of this 2011 saw a 7.9% increase of new domain registrations on last year. The top level domains of .com and .net domains are the most popular with over 108 million registered…