One of the features of Go2.me is that it can tell you how many users are visiting your link. One problem I've been noticing lately, is that I am counting users that aren't real people.
I experimented with twittering a link, and then looking at the viewers of that link shortly after. I'm seeing a number of Bots crawling twittered links right away. From my server logs I see the following request that got counted as real users:
220.127.116.11 - - [10/Mar/2009:11:57:13 -0700] "GET /xL HTTP/1.1" 200 8416 - "Mediapartners-Google,gzip(gfe),gzip(gfe)"
18.104.22.168 - - [10/Mar/2009:12:00:25 -0700] "HEAD /xL HTTP/1.1" 200 9468 - "AideRSS 2.0 (postrank.com),gzip(gfe),gzip(gfe)"
xx.xx.xx.xx - - [10/Mar/2009:12:00:56 -0700] "GET /xL HTTP/1.1" 200 9468 - "Mozilla/5.0 (X11; U; Linux i686; en-US; rv:22.214.171.124) Gecko/20071204 Ubuntu/7.10 (gutsy) Firefox/126.96.36.199 FirePHP/0.0.5.26,gzip(gfe),gzip(gfe)"
188.8.131.52 - - [10/Mar/2009:12:01:22 -0700] "GET /xL HTTP/1.1" 200 9469 - "WWW::Shorten::TinyURL/1.90,gzip(gfe),gzip(gfe)"
184.108.40.206 - - [10/Mar/2009:12:01:35 -0700] "GET /xL HTTP/1.1" 200 9469 - "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:220.127.116.11) Gecko/2009011913 Firefox/3.0.6 TweetmemeBot,gzip(gfe),gzip(gfe)"
18.104.22.168 - - [10/Mar/2009:12:08:03 -0700] "HEAD /xL HTTP/1.1" 200 9468 - "Chat Catcher - (http://chatcatcher.com/bot.htm),gzip(gfe),gzip(gfe)"
22.214.171.124 - - [10/Mar/2009:12:08:33 -0700] "HEAD /xL HTTP/1.1" 200 9470 - "PycURL/7.19.3,gzip(gfe),gzip(gfe)"
Note that the link was posted at 11:57 - so these requests came in from 6 seconds to 10 minutes after Tweeting the original link. Only one of these listed was a "real human". So, Go2.me is counting 6 unique users that are actually Bots.
To fix this, I'm going to be changing my counting algorithm to require that you've successfully received a Go2.me cookie (as a normal web browser would do), AND that your browser has successfully made an AJAX request to the server to receive a Chat update. This should eliminate all Bots and Crawlers as falsely being reported as "Vistors" to Go2.me links.