" For me it's this weeks quest. I don't want to spam stuff to random people. "
You don't have to spam random people. If you go into the forums and look at the threads you will find a list of people who actually want to receive wall spam to complete the quest. Then just spam those people and they usually return the favor.
I found this quest set was really fun because you can get some crazy posts on your wall and it kind of makes me feel more like a part of the GB community. I know that sounds strange but when you start sending wall messages back and forth with random people and get to see their profile pages you realize how many different and awesome personalities are here in the GB community.