5. A non-transitory computer program product to dynamically display a presentation of a time duration, the computer program product comprising a computer readable storage medium having program code embodied therewith, the program code being readable and executable by a processor to perform a method comprising: receiving comments associated with the presentation, the comments arranged in a first ordering; identifying a time reference comment among the comments, the time reference comment including a time reference, the time reference referencing a time instant within the time duration of the presentation; dynamically changing a display of the comments from the first ordering to a second ordering at the time instant, the second ordering of the comments representing a rearrangement of the first ordering of the comments, wherein the changing the display begins a first specified time length before the time instant and lasts until a second specified time length after the time instant; and changing the display of the comments back to the first ordering after the second specified time length after the time instant.
5. A non-transitory computer program product to dynamically display a presentation of a time duration, the computer program product comprising a computer readable storage medium having program code embodied therewith, the program code being readable and executable by a processor to perform a method comprising: receiving comments associated with the presentation, the comments arranged in a first ordering; identifying a time reference comment among the comments, the time reference comment including a time reference, the time reference referencing a time instant within the time duration of the presentation; dynamically changing a display of the comments from the first ordering to a second ordering at the time instant, the second ordering of the comments representing a rearrangement of the first ordering of the comments, wherein the changing the display begins a first specified time length before the time instant and lasts until a second specified time length after the time instant; and changing the display of the comments back to the first ordering after the second specified time length after the time instant. 8. The computer program product according to claim 5 , further comprising identifying a second time reference comment among the comments, the second time reference comment including a second time reference, the second time reference referencing a second time instant within the time duration of the presentation, and dynamically changing a display of the comments to a third ordering at the second time instant.