Photographs have significant social roles. For example, they help families and friends to preserve an affective link and provide
support forcommunication. The increasing popularity of digital photography, combined with global networking, is likely to
emphasize this function as sharing photographs will become cheaper, faster and easier. Based on this observation, we propose
a framework that allows people to maintain mutual awareness by exchanging and annotating photographs. The framework components
include digital cameras running specific software, a distributed communication and storage infrastructure, tools for watching
and annotating photographs. The framework also includes tools for notifying photographers when their pictures are accessed.
Acknowledgements This work was partly supported by the Japanese government with a Monbusho scholarship awarded to the first author. The authors
are thankful to Eastman Kodak for providing them with the Digital Science DC260 digital camera used to implement the prototype
system. The authors would also like to thank Mark Sifer for his helpful comments.