My question is about the Jewish ethics of using a false identity to post comments on the web. In particular, if I want to comment on something posted (perhaps in a blog, or write a review of some book or product), am I acting ethically if I create a 'fake' name and use an email address that can't be identified as me? Is the answer different if I am writing critical things about a product or work, even if I am telling my actual opinion and/or experience with it? Does this change if I am writing comments telling people about my own work and encouraging them to go see it on another site, or praising things that I sell? What are the boundaries? I know there are some because I recall an incident in which an academic created false identities and praised his own work, while denigrating others' works, and that was thought to be unethical, if not illegal. What do Jewish values and ethics teach in this area? Is it ever okay to use an alias or false identity, and if so, what are the limits or boundaries?