http://www.facebook.com/ChaptersIndigo

"Back by popular demand…and to celebrate our page reaching 200,000 fans…it’s the plum drop game! Through Jan. 25, play every day to collect up to 100 plum points & to receive an entry into the grand prize draw for 100,000 plum points! "

You have to like them on Facebook and have a plum rewards account (which are also free)