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Mozilla is already revising its new Firefox terms to clarify how it handles user data
(www.theverge.com)
This is a most excellent place for technology news and articles.
I would definitely call that selling my data. The recipient can now add that to my profile as an interest.
The recipient doesn't get any identifying data about you, because the data that shows the link was clicked does not identify you as an individual, since it's passed through privacy-preserving protocols.
To further clarify the exact data available to any party:
There isn't much of a technical difference between this, and someone seeing an ad in-person where they type in a link, from a practical privacy perspective.
Their implementation is completely different from traditional profile/tracking-based methods of advertising.