Called Google+ History, this new API will let you add past statuses, updates, purchases, pictures, and more to you personal Google+ timeline from a variety of social and mobile services. These objects are displayed in pretty tiles called “moments.”
This feature wasn’t included in the Google+ update announcements at Google I/O, the company’s developer conference happening this week in San Francisco. But it ties Google+ to existing social networks in some interesting ways, and it may soon have some ties to the just-announced Google+ Events as well.
With History API-enabled apps, you’ll be able to browse through your Google+-linked accounts on a range of social services and apps — Gray mentioned Foursquare and Twitter as examples. You can then pick and choose from past events, images, updates, and checkins, pulling those items into your Google+ profile.
For developers, it’s a great way to push your app’s content into the Google+ stream — and with any luck, create a Facebook Timeline-like bump in usage similar to how you’d use Facebook Actions for your app’s structured data.