An Epigraph is a multiuser social network site, which displays the status updates and content of an Epigraph group. Each member of a group has their own space on the site, like a tile on a wall, and this shows their content. Content is created by sending messages to the Epigraph address. Messages can be sent via any channel - email, MMS, SMS or voice.
Reference:
Lindley, S. E., Harper, R., Sellen, A. 2009. Desiring to be in Touch in a Changing Communications Landscape: Attitudes of Older Adults. In CHI'09
http://plei-plei.info/epigraph/