A few weeks ago, we posted a bit about Dalton Caldwell's argument that a fee-based Twitter made more sense for users, because the company wouldn't put advertisers first. Caldwell, of course, has now put his development skills where his mouth was and recently launched App.net, which kicked off with a Kickstarter-style funding campaign in which it sought $500,000, mainly from users who would pay $50/year for the service. Developers could pay $100 and there was a "pro" tier for $1,000. Over the weekend, the fundraising effort hit the target mark and it has since shot well past the amount.