Is it safe to have a group of web 2.0's all with nice original content, regular updates etc as my first tier and blast them with SB AA Lists as my second tier? Maybe a third tier is better? Like this other option I'm considering which is to build a group of lower end sites, all with paid for domains, different hosting, different ip's etc as my firt tier. 2nd tier web 2.0's. 3rd tier SB AA list blasts Its about a 10k exact term but really low comp.