I'm promoting one of my websites on several niche related forums. Most of these forums allow the users to create blogs (just like BHW does). Is it a good idea to create these blogs, and then blast some big 3-4 tiered link pyramids. The forums I use only have high PR, so I guess they won't be harmed. Is this a generally good idea? I see many people promoting their websites in these blogs, but what about linking to the blog? Will that give more juice to the link?