Methods for providing to the presenter visual feedback regarding the screen data received by one or more viewers in an online presentation environment having a presenter transmitting screen data to one or more viewers over a network may include: transmitting data representing changed visual data; receiving confirmation of receipt of the changed visual data from one or more viewers; generating a representation of the visual data received by one or more viewers responsive to the received confirmation data; and displaying the generated representation at the presenter. Corresponding systems may include: a transmitter which transmits data representing changed visual data; a receiver which receives confirmation of receipt of the changed visual data from one or more viewers; and a display generator which generates a representation of the visual data received by one or more viewers responsive to the received confirmation data, and which displays the generated representation at the presenter.