Hilary Smith Geraldine Fitzpatrick Yvonne Rogers Eliciting reactive and reflective feedback for a social communication tool: a multi-session approach. 39-48 2004 conf/ACMdis/2004 Conference on Designing Interactive Systems http://doi.acm.org/10.1145/1013115.1013123 db/conf/ACMdis/ACMdis2004.html#SmithFR04