The latest release of Yahoo! Mail displays messages from YAP apps in the welcome tab for all users, giving your app more social power. YAP was built intentionally to have a social focus. We've made it easy to produce Updates (our activity stream of user events). We've also provided easy-to-incorporate hooks so that your users can share your app and invite friends to use it (when you leverage the yml:share and yml:message YML tags). Now these messages show up in Yahoo! Mail not just as email messages, but also as Recent Apps Activity.
Yahoo! Mail is used by hundreds of millions of people, and an invitation from a friend is a lot more compelling than even the most targeted ad. For all of you who already have published your own YAP app, we have even more good news. You don't have to do anything to make messages generated via yml:share and yml:message show up in Yahoo! Mail. They're already showing in the What's New tab.
The Yahoo! Application Platform (YAP) is an OpenSocial-compliant container you can use to deliver all kinds of applications: from social games to mini sites, from finance trackers to targeted advertising. Yahoo! users install your apps on the Yahoo! Homepage, MyYahoo!, the Yahoo! Toolbar, and Yahoo! Pulse (our new profiles product available in more than 30 markets around the world), as well as Yahoo! Games and Yahoo! Messenger later this year. With more than 600 million users worldwide, Yahoo! provides a massive potential audience for your app.
In the future, we'll be expanding the visibility of app notifications even further, so be sure to watch this space for more announcements.