Fresh from Google Reader (I think) is some documentation. Wow! It's nice to see some documentation. In particular, the kind folks are Google Reader talk to us about their automated feed recommendations ("How do feed recommendations work?"):
Your recommendations list is automatically generated. It takes into account the feeds you're already subscribed to, as well as information from your Web History, including your location. Aggregated across many users, this information can indicate which feeds are popular among people with similar interests. For instance, if a lot of people subscribe to feeds about both peanut butter and jelly, and you only subscribe to feeds about peanut butter, Reader will recommend that you try some jelly. This process is completely automated and anonymous; your personal information will be protected in accordance with our privacy policy.
Two things to note:
- Automated feed recommendations are based on current feed subscriptions, web history and geographic location
- Optimizes based in part on things you don't know but should know
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