Is it worse to write relevant content on your own blog and post it, or to troll the rss feeds and jump on content that someone else wrote and post it all the ti

Is it worse to write relevant content on your own blog and post it, or to troll the rss feeds and jump on content that someone else wrote and post it all the time? The latter one seems even more fishy to me. If you create bad/irrelevant content wouldn't the constant down votes solve the problem?