The Stipple API is free, has no request limits as of yet, and OAUTH 2 will be supported in the future. According to its website on the API, it is "inspired by REST". Stipple announces its rare downtime, which is usually used to migrate data, via its twitter account.
Stipple allows users sharing photos to add identifying information that pops up on icons as you roll your mouse over the image. Check out this image of Daniel Day Lewis, Stippled by Erin Frederick. Not visible are the little icons that pop up on the mouse rollover: a little letter i for information about who took the photo, an icon that pops up biographic information about the actor, a social media icon for liking the photo, and an icon for the Lincoln movie trailer. As you can see, you can play a movie right off the photo, without ever leaving the webpage. Move the mouse away and the image underneath remains, the icons having disappeared.
Users aren't limited to how many links can be added. At the Stipple homepage there are examples of photos with just a link to a text box and nothing else, and photos that have multiple social media links (one for Facebook, one for Twitter), photos that link to many other photos, and so on.
Stipple looks ready for takeoff. Rip Empson reports in Techcrunch that Kleiner-backed Stipple just received $3 million in backing from Sands Capital,
"But what is likely of most interest, given the uproar around Twitter pulling its support for Instagram photos within its stream, is Stipple’s recent Twitter integration, which brings the company’s interactive content in-stream, within Twitter. This new integration utilizes Twitter Cards, which allow developers to embed multimedia experiences into tweets and Twitter streams."
"When Stipple-powered images are tweeted out into the Twitterverse, users can click on those tweets to view cards that reproduce the image with Stipple links embedded. This means that users can interact with products directly from their Twitter stream, checking out product info, videos and alternate views. Naturally, this is ideal for Twitter, as it enables users to get more of a 360-degree view of whatever is being advertised or shared without having to click away from Twitter to dive into the product."
A video on the homepage demonstrates how users can track usage of their photos and other analytics.