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Although relatively new on the scene, social media has become a powerful force - growing fast in scope, audience and influence. Social Media data comes in many forms: blogs, micro-blogs social networking, wikis, social bookmarking, social news ,reviews, and multimedia sharing. Online social media represent a fundamental shift of how information is being produced, transferred and consumed. Today On-line information reaches us in small increments from real-time sources and through social networks. The present paper investigates information flow through Social Media by analyzing underlying mechanisms for the real-time spread of information through on-line networks and various mechanisms that can be used to correct the effects and biases arising from incomplete and missing data. The methods that we study to trace the information flow includes cascading links to articles, URLs and hash tags on Twitter. We address the problem of missing data in information cascades. Our studies show that the k-tree model is an effective tool to study the effects of missing data in cascades.