If you follow hashtags, then you may have found WhatTheHashtag to be a very useful free service.
This morning I went to do a hashtag search using the service and received this screen.
If you know the folks behind WhatTheHashTag, let them know that you love the service and encourage them not to let the service lapse. It’s a valuable tool.
UPDATE: The domain is back up. That’s a good thing because WhatTheHashTag is a valuable service. Thanks for coming back to life, @wthashtag.