What font does flickr use? Starting 2004 flickr logo has been using Frutiger font .
In 1968, Adrian Frutiger was commissioned to develop a signage system suited to the architecture of the new Charles de Gaulle Airport outside Paris; he designed a simple, clean, robust sans serif type that is highly legible. In 1976, Frutiger completed the family for the Stempel foundry.
Free alternative fonts for flickr logo:
The closest free font you can get is M+ 2c heavy font
About free font:
Font by M+ FONTS