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iStalkr is a web app that allows you to create a lifestream (based on Jeremy Keith's Lifestream concept) tracking all your RSS and ATOM feeds for services you use, like Digg, Del.icio.us, Ma.gnolia, Flickr, Last.fm, Google Reader's Shared Items, Tumblr, Twitter , etc, and create a time line of your activities. You can paste this time line data into on your blog or use the data in other apps. iStalkr then utilizes that data socially, like twitter, where you can monitor your friends time lines and other people can monitor yours.