Simple solution to this is to have a backup or failover to a non-AWS Datacenter too, basically don't be just dependent on one Datacenter. E.g. MS Azure/Google/Rackspace
This not only spreads your risks but keeps your customers happy.
So what exactly did Google steal? The idea of grouping people together is not exactly new, and people have referring to their social groups as "social circles" for a long time now. Honestly I doubt they even saw your site—you have very little marketing or exposure, so they probably don't even know you exist.
As far as I'm concerned this is just sour grapes. To answer your question, just move on. You're reading far more into this than you should, and even if they did take your "ideas" there isn't anything you can do unless you patented them.
