bluntforce - 5:31 pm on Dec 8, 2012 (gmt 0)
In your message #4525775:
There is an IP 188.8.131.52
There is an IP 184.108.40.206
Six minute span, user information is the same. When I see things like that, I tend to think bot.
If you have the option of doing so, it might be interesting to take a day's worth of "short visitors", sort them by IP and look for patterns both in IP address and other fields.