You can think of it like that, a scrapbook that updates everyday with new things about your chosen subjects. Or you can think of it as a newspaper in which there are only news about things you like. It's quite close to a Facebook/Twitter feed where you would follow companies/projects/artists you like, with the notable difference that there is not a centralized authority (the owners of Faceook or Twitter) who can decide to change your experience (by altering what you see, removing some content, adding some ads or whatever). Oh, and also, you can't comment. :) (but the articles you're reading in your aggregator have links to their original web page, which often contain a comment section).