The messages displayed are from a live audience, shown on a video at Vimeo, which explains:

. . . the interactive system ONEWORD is a social display of crowd moods and feelings during an event: people send SMS to a special number and the messages are then displayed with a tree-like generative graphic software. As soon as a new message arrives a new branch blossoms.
As the event unfolds layers of texts gradually build up a flowing foliage of collective memory.

One of several similar links at Information Aesthetics