>>5119610 Screen shots from DoS FOIA reading room. These are almost always rabbit holes.
Two search terms used - "google +", "gmail" AND "draft". Looks like the DoS rolled out Google+ in 2012.
(Link is for second search for drafts.)
https://foia.state.gov/Search/results.aspx?searchText=%22gmail%22+AND+%22draft%22&beginDate=&endDate=&publishedBeginDate=&publishedEndDate=&caseNumber=