CiteULike.org closed at $36,000 on GoDaddy auctions. This is the kind of name that newcomers need to understand why it went so high. It was not for the name.
Popular with researchers. According to Wikipedia:
was a web service which allowed users to save and share citations to academic papers. Based on the principle of social bookmarking, the site worked to promote and to develop the sharing of scientific references amongst researchers.
CiteULike was created in November 2004 and further developed in December 2006, running until March 2019
This is a gold mine for those into aged SEO domain names. According to Ahrefs the site has:
Domain Rating 76
Backlinks 14,349,778 91% dofollow
Referring Domains 15,182 74% dofollow