@henrix I had a quick look and I don't have any invites to send. To be honest I don't think you're missing out on anything. Of all the sites I've tried over the years ourgtn probably had the least content that I wanted and the interface wasn't great. I found it a real pain to browse through to find anything I actually wanted.
After the problems with the site last year(?) I personally feel it's gone even further downhill, to the point where I don't even bother to check it anymore. It's a shame, but the site never really seemed to reach that magic point where it attracted lots of new users with new content.