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Members Fly to Europe for $150 Dollars gives Famous Quotes as High Priority points at the use of Quotes as an indentifier of "Popular" rank.

Sat, 19 Mar 2011 08:16:04 has categories, one of them is Quotes, this to me is a sign that quotes have a higher than normal valuation with search engines.

Tumblr Defined: Tumblr is a microblogging platform that allows users to post text, images, videos, links, quotes and audio to their tumblelog, a short-form blog. Users can follow other users, or choose to make their tumblelog private. The service emphasizes ease of use.