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In this paper, we present a framework to analyze and summarize the temporal dynamics within personal blogs. Blog temporal dynamics are difficult to capture using a few class descriptors. Our approach comprises of (1) a representation of blog dynamics using self-similarity matrices, (2) theme extraction using non-negative self-similarity matrix factorization, and (3) a visualization representing blog theme evolution. Summaries based on large real-world blog datasets reveals interesting temporal characteristics for four blog types - personal blog, cooperative blog, power blog and spam blogs.