Hey guys we are a startup working in the same domain as you guys, we help people to collaborate to figure out how to solve a problem in less than 10 links, and connect problems to other problems. Here is the link http://knowledgemaps.org/

If you like it can you send it as a potential replacement to your user base. Some of them maybe like it better than google spaces.

Would love to talk to the founders to get some feedback on what we are doing .

Looking forward to hearing from you