Anyone know this group?

I receive 3 or 4 scams a week about reviews/PR etc for my books. I always ask for references and a website and they go away. This one assures me she is genuine and gave me this as her group’s website:

4000 Readers & Reviewers

Certainly it sounds more real than the others but I am cautious as it doesn’t take long to set up a website. Anyone had dealings with them?