hmm I think there's something wrong (bottom of Steam homepage right now). If I buy a $5 game I get $30 discount? :P @tomgvalvepic.twitter.com/UrjM4OOmBx
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Yes that is my assumption although if they want to give me 25€ then I won't say no. 
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.