This is a great idea for both people looking to promote their startups and people running newsletters. I'll be trying it out from both angles to promote my startup[0] and my Email Marketing Weekly newsletter[1].

I am curious to know the monetization strategy? Your site reads "won't charge you anything for it nor will we take a percentage of your sponsorship deals", so what is your angle?

[0] http://newsmaker.io - build your own curated newsletter [1] http://emailmarketing.newsmaker.io/