Why do ISPs and PR/advertising agencies have the same names?

Ever since installing StatCounter I've become ever increasingly interested in my blog's traffic and where it's coming from.  The coolest thing is seeing I have visitors from Greenland to New Zealand and even at the International Space Station (okay I made the last one up!)

But once the thrill of seeing you have an audience from Tipperary to Timbuktu wears off (there's a long way between them, apparently) you want to know a bit more about who they are and why they're reading.  That may sound a little 1984 but it isn't really.  A lot of it is me using common sense (I have some in reserve) and doing some educated guesses.

As interesting as it is to see regular folk using the likes of AOL or Virgin Media it's more intriguing to see what companies and organisations visit and why.  Yesterday, for instance, I had the US EPA.  Why?  I think they were scanning for key phrases related to pollution and coincidentally one of my posts had that phrase even though it had nothing to do with the enviroment.

For many differing reasons it's interesting to see what PR companies and advertising agencies look at one's blog.  The only thing is many of them have almost identical names to that of ISPs!  Usually some random word followed by something like 'Communications'.  Hence this post.