What does this mean

[Roger]

I was browsing a site in Firefox and a page black site with a green logo 
opened that said "Hacked by Nobody".

I read about the Nobody group in the Daniel Domsschiet-Berg book "Inside 
Wikileaks" but do not know the relevance for me seeing that web page.
Can someone please explain this, is it something to be concerned about?
If so what steps should I take?

There is nothing on my pc of any interest to any one and I can find no 
key loggers of note. I do not know what else to look for.
I am working in a voluntary capacity on a remote server setting up a 
number of drupal sites, would these be in danger please?


Thanks in advance
Roger