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Blog and written status updates are descendents of diaries, memoirs, commonplace books and autobiographies. Selfies are descendants of visual artists’ self-portraits, and the quantitative modes of lifelogs, personal maps, productivity records and activity trackers are descendants of genres such as accounting, habit tracking and to-do lists.
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Jill Walker Rettberg (Seeing Ourselves Through Technology: How We Use Selfies, Blogs and Wearable Devices to See and Shape Ourselves)