1. A system for annotating a video, the system comprising: a touchscreen display configured to present video content and receive user input during the presentation of the video content, the video content having a duration, the touchscreen display generating output signals indicating a location of a user's engagement with the touchscreen display; and one or more physical processors configured by machine-readable instructions to: effectuate presentation of the video content on the touchscreen display; determine reception of annotation input based on the location of the user's engagement with the touchscreen display at one or more points within the duration, the annotation input defining an in-frame visual annotation for the video content; responsive to the reception of the annotation input: associate the in-frame visual annotation with a visual portion of the video content based on the location of the user's engagement with the touchscreen display; and associate the in-frame visual annotation with the one or more points within the duration such that a subsequent presentation of the video content includes the in-frame visual annotation positioned at the visual portion of the video content at the one or more points within the duration.