Social Collider is an interesting data visualization tool that reveals connections between conversations on Twitter. Sascha Pohflepp and Karsten Schmidt created the software, which can make the cultural spread of ideas visible.
Information Aesthetics explains how it works:
One can search for usernames or topics, which are tracked through time and visualized much like the way a particle collider draws pictures of subatomic matter. Posts that did not resonate with anyone just connect to the next item in the stream. The ones that did, however, spin off and horizontally link to users or topics who relate to them, either directly or in terms of their content.