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A large contributor to the growing Internet traffic is user generated content shared via online social networking websites. Our insight is that these websites can reveal valuable information that can be used in content delivery networks for better caching and pre-fetching performance. In this paper, we combine five different datasets from Twitter and other sources, and make several observations that can lead to helpful heuristics for better content placement. In particular, we study the temporal growth and decay, the geographical spread, and the social spread, of topics on the social network. We also describe in detail our methodologies for data collection, that can be useful for other researchers working in this space as well. In the future, we will use these observations to design heuristics for improved CDN performance.