Comment Flow is a flexible tool for the content-driven exploration and visualization of a social network. Building upon a traditional force-directed network layout, our system shows the activity and the information exchange (postings in the comment box) between nodes, taking the sequence and age of messages into account. This project serves both as an illustration of one approach to the general problem of individuated network visualization and as an example of the practical uses of such representations. By going beyond the �skeleton� of network connectivity and looking at the flow of information between the individual actors, we can create a far more accurate portrait of online social life.