Abstract: Users may collaborate on a document and be notified of changes (e.g. comments, changes) made to the document using different notification methods. A comment may be added to the document from within the document and/or externally from the document. A comment may also be added to a comment stream (e.g. a thread of related comments). The different notification mechanisms may include mechanisms such as: Short Message Service (SMS), Multimedia Messaging Service (MMS), electronic mail, phone call, Instant Messaging (IM), social network post/message, toast message, live tile, and the like. A user may configure the desired notification methods. A newsfeed may display a feed of collaboration items that reflect comments/changes to the document. The user may select a displayed collaboration item from the newsfeed to access the document. A user may also respond (e.g. comment) to a notification that may be added as a comment in the document.