There's no way to determine if they are primarily tech workers in this group, as they seem to value their anonymity very much. (from their fb page)

Nice UI touch there, Project Noah.

Here's another interesting app: http://leafsnap.com/ Leaf snap, click a photo of a leaf and you get ID suggestions. Both apps are very cool!

Thanks Vanchi! Leafsnap is great and I enjoy using the app. When we launched the Project Noah app last year, this space was empty, but lots of new and cool apps/websites are out there now. Also check out iNaturalist and Scispy (by the discovery channel).

Needs poison ivy detector!

Circles would make great sense if we can push some circles into other circles. Close friends into friends and friends into general connections.

Well yea. Sounds good in the UI. But I wonder if that is even implementable in their current data model.

I think so. Check this video http://www.youtube.com/watch?v=vnv1Mbj1jKw&feature=relmf... They pull the same people into different circles. (People don't fade out)