WolframAlpha have now launched Fun Facts on Twitter. Note that you can read these facts even if you are not a Twitter user.
WolframAlpha have written on this in their own blog.
Now here’s an impressive fact from WolframAlpha on just how popular WordPress is: 
On the subject of Mathematics Fun Facts – a reminder of these sites mentioned in earlier posts.
Tanya Khovanova’s Number Gossip
Amazing Number Facts from Madras College.
