After XE user contest, many people have interest in this project. The server of is suffering from traffic overload.
Today, I tuned my Apache server. Let's see the progress for some days.
As this service stopped today, you can use http://bek.me, http://social.softnex.kr or other SocialXE server providers like socialxe.net. They offer SocialXE Client token as socialxe.net. You can use their client token and provide never-stop service on your site.