I remember Mozilla having a lab project in 2009 called Raindrop [1].
"Raindrop is a messaging application building on Apache's CouchDB which is used through a web interface. Raindrop works by collecting messages (currently emails and tweets, but more will be available through addons) and storing them as JSON optionally with attachments in CouchDB."
"Raindrop is a messaging application building on Apache's CouchDB which is used through a web interface. Raindrop works by collecting messages (currently emails and tweets, but more will be available through addons) and storing them as JSON optionally with attachments in CouchDB."
[1] https://en.wikipedia.org/wiki/Mozilla_Raindrop