Dear Sirs,
I represent 1stClassProjects and I've just discovered this site.
Please ask the person who posted the first message to put their name and project details under here within 48 hours, so we can properly examine this allegation.

As a small, but credible, enterprise that take ourselves seriously, we are not prepared to allow unsubstantiated comments hurt our business. Especially when they come anonymously.
For the moment, this request is unofficial, but I must say that the initial message from the "client" seems very fishy. Not only is it anonymous, it's also not posted on a British website (making it costlier for a reputable company to fight back legally), and it says that the "client" paid in euros, when in fact we only quote and accept payments in British Pounds Sterling (GBP).
I would have expected the administrators of this site to have shown due diligence by making a very small effort to notify us before having such a comment appear on a popular website like this and potentially costing us thousands of pounds.
I will be expecting your response, or your action to take down this thread.
Thank you,
Peter Richardson
Quality Results Ltd
We're looking into US legislation with regard to what you've claimed, i.e. that your members have the right not to reveal their source of information, as well as other legal issues such as defamation and slander.
It seems unfair to us that anyone can log onto your website anonymously and post defamatory comments about our company, and then have your protection with regard to concealing their identity, the details of their project, the date when they became a client, etc.
Let me ask you this then: How do we know that you're not a site sponsored by or affiliated with a competitor of ours that posts fake comments about our site in order to get our competitor more business? We don't, you see.
If your user doesn't show up by tomorrow or if his story (when they tell their real story) does not corroborate with our registered client information, we will expect you to (1) delete this thread, and to (2) apply to major search engines to delete the page's cache from their servers.
I'm sure you understand that such defamatory comments can hurt a legitimate business, and that facilitating such an action makes you liable to pay damages. With your site appearing first when someone looks for our company name and domain names, and with our decrease in conversions (visitors to paid clients) in May, there's a very good chance that your site has already cost us more than half our monthly revenue.
We still think that this can be resolved out of courts, so please email me to discuss this matter in private. If we don't agree, we will both still have all our other options open.
You have my email address.
Thank you,
Peter Richardson
Quality Results Ltd