Hi, Excuse my ignorance but I'm about to setup some manual web 2.0 properties but I'm trying to work out why they are considered to be so powerful. Domain has a high PR and content is relevant to my site which should give me a boost but it obviously has no page PR. Does this really give a massive boost? I've heard people saying that blasting them with scrapebox or xrumer will let the link juice pass to your money site. Is this the case?