A little investigation is always necessary with these sort of posters...
#1 - one post at GGandJ... = Suspect
#2 - PR5 site that is not well know or long established = Suspect
#3 - PR 5 site that is not ranked for any of their prime keywords(as per their title/page text)= Suspect
- eg:
http://www.dangerdave.com.au/ - is PR 5 page and is ranked for
dangerdave,
adult links,
adult porn,
adult sites etc.
A (TB)PR 5 page that is ranked for nothing.. is just an illustration of how useles a measure PR really is.
#4 Blog Spam and Message Board/Forum spam the new bane of the web..!! I delete up to 50 of these pricks, signing up for false accounts, every week across the message boards I run.
DD