I'm making a website with my friend, it has same purpose like digg, but with many new and exciting features. so, all articles are submited from other websites (we do provide links and redirect) but my question is, should we index those links? I ask that because i'm thinking what if google finds that "spammy" and punishes website ? all articles would have title, 30-40 words,image of text and external link. What do you think, should we index all or avoid ?