  Many groups with diverse convictions are interacting online. Interactions in
online communities help people to engage each other and enhance understanding
across groups. Online communities include multiple sub-communities whose
members are similar due to social ties, characteristics, or ideas on a topic.
In this research, we are interested in understanding the changes in the
relative size and activity of these sub-communities, their merging or splitting
patterns, and the changes in the perspectives of the members of these
sub-communities due to endogenous dynamics inside the community.
