Google vs. Viacom (class comment)

Right before our exam we discussed the suit Viacom filed against Google's YouTube on the 13th of March. I liked the debate we had in class, although I can understand both sides of the story. However, it is not acceptable that Google bears no responsibility over the content which is put up on YouTube. Wikipedia has very strict regulations on their site regarding copyright issues. They give you a small amount of time to prove the copyright and if it is not acceptable, they delete the content. Now, does that mean that Google is trying to profit off of these illegally posted video clips? That seems to be the only logical explanation. With the technology we have today, there is not reason why Google doesn't follow similar practices to Wikipedia. I guess civil action might rush their technological advancements to keep out pirated clips.