WalletMatch make it very easy for friends to compare the stocks / mutual funds holdings. Although purely competitive aspect is there so can win such money.
It is supposed to work like Facebook and LinkedIn, where users themselves determine who they want to be friends with. Here, you steer with whom they want to share the progress with. They are not supposed to be sharing development in currency but only a percentage.
This system is develop by users for users.
- iPod Touch