Social Mention search engine dead?

It looks as thought Social Mention - real time search engine may well have died. I've been trying it every day for the last week, and I have been unable to reach it. I've tried a few of the services to see if the site is up or down, and they've all come back and said that it's unavailable. This will be a real blow to social media searchers, as it's always been an excellent engine, and it will be sorely missed if it has closed. There have been a few queries on their Facebook page, but no response from the company. If anyone knows anything official - please add it into the comments!