(CNN) -- Sure, lots of folks might be excited about a Twitter-like social network with no ads or annoying "promoted tweets." But would they pay for it? The founders of App.net think so, and so far they've found more than 10,000 people who agree with them. The startup promises a "real-time feed" that will never be supported by ads. Instead, they'll charge a fee that, at least for now, looks to be about $50. That's how much it took to support a Kickstarter-like fundraising campaign that has netted more than $670,000 and wraps up Monday. Founder and CEO Dalton Caldwell says he's been disappointed by the advertising models of sites like Twitter and Facebook and thinks users will be willing to plunk down money for an alternative.
@highlight
App.net plans to offer an ad-free alternative to Twitter, but users will have to pay
@highlight
A Kickstarter-like fundraiser generated more than $670,000 to start up
@highlight
Charging fees lets the service focus on users, not advertisers, founder says
@highlight
Minimum donation was $50, but analyst predicts that will get lower
But when @placeholder started, I don't think anyone knew there was a business there either.