Mgyovanni,
I don't see an official announcement as to the contest being extended. I think its possible one of the other admins on the facebook page might have accidentally read it as the voting ending on the 31st, instead of reading the rules and seeing that the voting actually ended on the 29th, with winners being announced on the 31st.
however that being said, I'm unable to contact anyone I know to confirm this, so it is possible they might leave voting possibilities up to the 31st, but I wouldn't guarantee thats the case.
-Slackin (Oregon Slacker on Facebook)
**Updated***
The FB post was in error, the official ending of voting is indeed on the 29th.