[sugarfactory]

Why is it hard to track users when DuckDuckGo has access logs (tuples of date/times, ip addresses and queries) and ISPs have a pair of a date/time and an ip address -> a real identity mappings?

[relicscattergun]

Well, according to tracker detection service Ghostery, an I.P. address is considered Pseudonymous information, unless you live in Europe, apparently.

[yclept]

IP addresses are not people