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In February, comScore reported that the site had passed 10 million monthly unique users faster than any standalone site ever.

But numbers from third-party sources like Facebook app tracking service, AppData, are pinning a slightly different picture on the image and link-sharing site. Pinterest’s monthly active users on Facebook — or the number that has connected to Facebook over the past thirty days — have dropped to 8.3 million, from around 12.2 million a month ago when the site did a major redesign. Daily Active Users are also down but not by as much: on April 21 they were 930,000, from 1.1 million on March 22.

A couple other sources including Google search trends, Compete and mobile app tracker App Annie are also showing a picture of decelerating growth

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2. Scribble

When you sign up for Flattr, a social micropayments service, you dedicate a flat fee per month to the site. As you're surfing the web, you can click "Flattr" buttons next to a blog post, song, or podcast to put your money where your "likes" are. At the end of each month, your flat fee is evenly divided amongst the creators you've chosen.

communities of creators (podcasters, citizen journalists, open source 3d printer hackers) are increasingly adopting Flattr as a virtual tip jar. The site's still small--70,000 users. The amounts are small, too--users pledge an average of 3 euros a month and click just a handful of times, with each click averaging half a euro in value. But as cofounder Linus Olsson told Fast Company today after his SXSW panel, the cultural impact of this kind of crowdfunding is growing.

"Money's just another tool to help people do what you think is important."