9. A non-transitory machine-readable storage medium comprising instructions that, when executed by one or more processors of a machine, cause the machine to perform operations comprising: receiving presentation data from a client device, the presentation data including a set of presentation elements; generating a composite presentation, based on the presentation data, the composite presentation comprising an arrangement of the set of presentation elements that includes a first presentation element at a location among the arrangement of set of presentation elements; causing display of a graphical user interface that comprises a first region and a second region at a group of devices, the first region of the graphical user interface comprising a display of the composite presentation that includes the first presentation element at the location among the arrangement of the set of presentation elements, and the second region of the graphical user interface comprising a newsfeed to display annotations on the composite presentation; receiving a selection of the first presentation element from a first device from among the group of devices, the selection including a user input onto the composite presentation; causing display of a request for annotation data at the first device in response to the receiving the selection of the first presentation element from the first device; receiving a response to the request from the first device, the response to the request comprising the annotation data, the annotation data including at least an indication of an annotation type, and an identifier associated with the first device; storing the annotation data at a memory location associated with the first client device; causing display of a notification element at the location corresponding to the first presentation element among the arrangement of the set of presentation elements within the composite presentation in response to the receiving the annotation data, the notification element comprising a graphical icon selected based on the annotation type, and including an annotation identifier and the identifier associated with the first client device; updating the newsfeed within the second region of the graphical user interface to include a depiction of the annotation data that comprises the annotation identifier and the identifier associated with the first client device; receiving a selection of the notification element; and responsive to receiving the selection, presenting the annotation data associated with the notification element within the second region of the graphical user interface.
9. A non-transitory machine-readable storage medium comprising instructions that, when executed by one or more processors of a machine, cause the machine to perform operations comprising: receiving presentation data from a client device, the presentation data including a set of presentation elements; generating a composite presentation, based on the presentation data, the composite presentation comprising an arrangement of the set of presentation elements that includes a first presentation element at a location among the arrangement of set of presentation elements; causing display of a graphical user interface that comprises a first region and a second region at a group of devices, the first region of the graphical user interface comprising a display of the composite presentation that includes the first presentation element at the location among the arrangement of the set of presentation elements, and the second region of the graphical user interface comprising a newsfeed to display annotations on the composite presentation; receiving a selection of the first presentation element from a first device from among the group of devices, the selection including a user input onto the composite presentation; causing display of a request for annotation data at the first device in response to the receiving the selection of the first presentation element from the first device; receiving a response to the request from the first device, the response to the request comprising the annotation data, the annotation data including at least an indication of an annotation type, and an identifier associated with the first device; storing the annotation data at a memory location associated with the first client device; causing display of a notification element at the location corresponding to the first presentation element among the arrangement of the set of presentation elements within the composite presentation in response to the receiving the annotation data, the notification element comprising a graphical icon selected based on the annotation type, and including an annotation identifier and the identifier associated with the first client device; updating the newsfeed within the second region of the graphical user interface to include a depiction of the annotation data that comprises the annotation identifier and the identifier associated with the first client device; receiving a selection of the notification element; and responsive to receiving the selection, presenting the annotation data associated with the notification element within the second region of the graphical user interface. 14. The non-transitory machine-readable medium of claim 9 , further comprising instructions, when executed by one or more processors of a machine, cause the machine to perform operations comprising: receiving a follow request on the annotation from a second user; receiving a comment on the annotation; and notifying the second user of the comment.