Cake Pusher will periodically scan its own Home Timeline for the keywords:
cupcakes, cupcake, cakes, cake
If it can be determined that two people have talked about cakes within 30 minutes and 50km of each other, Cake Pusher will dent:
@person1 @person2 You should hook up for cake: http://ur1.ca/foo
Where FOO is a map to a café that sells cake somewhere in between the two.