Yastalk is designed to get “honest feedback from your friends and co-workers .” You can use Yastalk to send and receive anonymous comments.
What's the point of Yastalk?
The idea is that you sign up, then send a link to your profile to whomever you want for feedback, even if that means posting it publicly online, and then anyone with that link can anonymously provide feedback.
How does Yastalk work?
So, you create your Yastalk profile, which anyone can visit. Even without logging in or having an account, people can visit your profile and leave messages, anonymously.