I might be wrong but have I noticed a new font on Flickr? It looks subtley different to me. Digging deeper, it appears to be a font called Proxima Nova. Perhaps it has been there for months but I like it.
Maybe I should think about the fonts on my own site (mainly Droid Sans) although perhaps I should take a look at my server logs first and figure out how many people actually visit the site as opposed to just picking up the news feed somewhere (at which point, I’m just delivering text; fonts are likely to get rendered by the news reader).