Thomas Olsson Hannu Toivola Minna Wäljas Kaisa Väänänen-Vainio-Mattila Jaakko Lehikoinen Collective Content as a Facilitator of Community Interaction: A User Study of Four Close-Knit Communities. 246-255 2009 HCI (12) http://dx.doi.org/10.1007/978-3-642-02774-1_27 conf/hci/2009-12 db/conf/hci/hci2009-12.html#OlssonTWVL09