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On Aug 15, 2014 5:52 PM, "Karen Coyle" <[log in to unmask]> wrote: > > On 8/15/14, 12:07 PM, Eric Hellman wrote: >> >> AddThis and ShareThis, on the other hand have TOS that let them use tracking for advertising, and that's what their business is. So, hypothetically, a teen could look at library catalog records for books about childbirth, and as a result, later be shown ads for pregnancy tests, and that would be something the library has permitted. > > > Eric, I'm wondering about the full scenario that you are envisioning. Many libraries use proxy servers, so individual users are not identified. (Meaning that an 80-yr-old man may get the ad for the pregnancy test, not the teen.) You're right, using the public access machines inside a library would be relatively free from being able to track an individual, particularly if they are purely anonymous sessions (such as a dedicated catalogue kiosk). I think the primary concern rises from users accessing the catalogue from their own machine / browser, where services can easily and reliably correlate web usage behavior of an individual over time across many web properties.