hi Bruce -
I am working on a droid app that accomplishes much of what you outlined that will in beta in about 3 weeks. It will be similar to apple's "find my friends" but it will emphasize privacy and temporariness. Networks are invite-based so the app is not a forum for meeting people, rather will be for keeping connected to different groups of of people using gps (ie. "my friends, my working group, today's march, etc.). If you have some particular scenarios you envision using a mobile app for please send them my way and I'll let you know what would be supported.