Jack - the short answer to your question is that no forum entries on the site are ever modified - and 99.9% of forum entries are left posted on the site, even if they say negative things about the firms that advertise here.
Consulting firms know that the frank exchange of opinions on this site is one of the reasons that so many consultants use it - and so to kill this off would be counter-productive. Most also monitor the forum as a means of knowing what both their employees and consultants outside the firm thing about them. So again it is useful feedback. Do a search for pretty much any of of our advertisers and you will find something negative has been posted about them by someone in the last months.
However, we do monitor forum posts and where comments are made that are totally unsubstantiated - and where the forum poster has remained anonymous - then we can't leave these on the site for obvious reasons. Otherwise every consulting firm could go online and make unsubstantiated claims about their competitors.
Of course one way to get around this would be for us to force all forum contributors to register and for their identity to appear alongside all their posts - but how many consultants do you thing would really share their honest views about their employer if they couldn't keep their identity hidden?!
Hope you can appreciate this is a difficult balance for us to strike, but in leaving almost all forum posts untouched we try to keep the debate and swapping of insights as unrestricted as possible.
Tony Restell (Top-Consultant.com)