1. A method comprising: (a) displaying, to a user via an electronic display associated with an electronic device, a login interface; (b) receiving, at the electronic device from the user, input corresponding to login credentials of a user account of the user; (c) communicating, from the electronic device, data corresponding to the login credentials; (d) displaying, to the user via the electronic display, a video selection interface configured to allow the user to a select a video for viewing; (e) receiving, at the electronic device from the user, input corresponding to selection of a video for viewing; (f) communicating, from the electronic device, data corresponding to the selected video; (g) receiving, at the electronic device, (i) data corresponding to the video, and (ii) data corresponding to a plurality of comments associated with the video, each of the plurality of comments being associated with a particular user account of a plurality of user accounts; (h) displaying, to the user via the electronic display associated with the electronic device, a video annotation interface comprising (i) a video pane configured to display the video, (ii) a video timeline bar including a video play-head indicating a current point of the video which is being played, (iii) a segment timeline bar including initial and final handles configured to define a segment of the video for playing, (iv) a plurality of comment markers displayed in connection with the video timeline bar, each of the plurality of comment markers corresponding to one of the plurality of comments associated with the video, (v) a comment display pane displaying text corresponding to at least some of the plurality of comments associated with the video, and (vi) a comment button configured to allow the user to add a comment to the video; and (i) receiving, at the electronic device from the user, input corresponding to selection of a displayed comment marker; and (j) in response to receiving input corresponding to selection of a displayed comment marker, (i) automatically moving the video play-head to a point on the video determined based on the selected comment marker, and displaying, in the video pane, a frame corresponding to the position of the video play-head, and (ii) displaying, in the video pane overlaid over the displayed frame of the video, one or more annotations associated with the comment marker.