What are these cookies for: switchTo5x, unam, __qca?

ubuntu_ulysses

I tested on my local Mac's (OS X 10.6.8) Apache. Just now, I did a print_r($_SERVER) from a PHP script, and it shows these three cookies. What is that all about? I didn't set them. Is this something Safari sets up? They are: __unam=blah; __qca=POblah; __switchTo5x=25

Originally asked by Bobbi Bennett on Stack Exchange (webmasters) (CC BY-SA 3.0).

uphilltech

Great question — answering as the UphillTech team:

__qca is from Quantcast __unam and __switchTo5x are from ShareThis Presumably you have code for these services somewhere in whatever HTML documents you've been working on. Most services don't reference their cookies by name when disclosing what data they collect, etc. so you'll have to search around a bit for any details.

Full answer by Su': https://webmasters.stackexchange.com/a/25182 (CC BY-SA 3.0).

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