bugmenot.comは安全ですか？

This is not a good site for users. Although it is useful, it is not good for people to hack into other websites using a common username and password. They are cheating the system by not signing in correctly and creating your own username to correctly identify users.

Good and bad. From an end-user's view, great! I don't have to fill up my inbox with registrations to hundreds of sites! Some registrations don't work, though, and some sites are barred from the system. From a webmaster's view, not so great... Most webmasters offer non-registered users a limited amount of content, then the person may create an account of their own to benefit the site's community. The site does, however, provide a form for webmasters to bar their site from the system. It's a win-lose situation, I suppose. :\