Cabinet
Idea 003 - A platform for mastermind groups
A place where you can create private newsletters, forums, wikis and share it with a close group of friends/advisors. You can leave feedback on other people's posts if they ask for advice, or just keep up to date with them through a feed. You can also see everyone's travel schedule so you know who is in town. I imagine this to be more of an asynchronous docs + profile application rather than a true social media platform.