In a post entitled, “I realized for the first time yesterday that Hatena is doomed” [昨日初めて「”はてな”はダメだ」と思った], blogger id:grgr56 explains how they tried out the new service “Hatena Bottle” yesterday [ja] and concluded: “Hatena Bottle is a spam trap”: “I noticed [after registering] that mails started coming. […] If you go to the top page of Hatena Bottle [ja], you'll see that nothing is written about what kind of service it is. I guess some people must consider it the fault of the person who registers for the service [that they end up getting spam mails]. Well, that was my mistake. I overestimated Hatena.”