Abstract: In this era of internet, the Online Social Networks (OSNs) are the platform to build social relations among people who share interests, activities, backgrounds or real life connections. OSNs have gained a ubiquitous status and this has led to security issues of posting unwanted messages on user wall. Therefore, in order to make the OSN user wall a secured wall, we are introducing a flexible- rule based system which provides users to control the messages that are posted on their walls and allows user to customise the filtering criteria to be applied on their walls. This system exploits machine learning based soft classifier for automatically labelling messages in support of content based filtering.

Keywords: Online Social Networks, Flexible-rule based system, filtering criteria, Machine – learning based soft classifier, content based filtering.