He's called André Pannison, and he basically took the Twitter conversation in Tahrir Square and the dots you can see are retweets, so when someone retweets a message, a connection is made between two dots, and the more times that message is retweeted by other people, the more you get to see these nodes, these connections being made.
他集中了侯塞尼・穆巴拉克辞职的那一天 来自解放广场的推特消息 这些点都是转发 如果有人转发了某一条消息，两个点就会建立联系， 一条信息被转发的次数越多 就会有越来越多的点出现，越来越多的联系建立。