Google+ history a.k.a moments is the latest buzz in the G+ world. This is something like that of facebook timeline but done the Google+ way (Not just limited to G+ instead share your moments from around the web).
This feature along with a history api was just announced in the Google I/O 2012 developer conference and available ONLY for the platform developers in as a developer preview.
Here is what google+ history according to them
Google+ history is a collection of moments that describe activities the user has engaged across the web and applications. You can use the Google+ history API to write to a user’s Google+ history and they can share the important moments in their life with their circles.
You can write many kinds of moments to the Google+ history based on the activities of the user within your application or site. Your application can classify the activities based on schema.org markup to accurately describe the moment.
This is the first time developers allowed to write to Google+ through an API (rest of the google+ api‘s just allow to read activity from the network).
Interested in developing applications for the google+ platform? then you should signup for the preview account and checkout the new api.