So I'm almost done building up a couple of expired Web 2.0s for a certain keyword as part of my Tier 1. All the content on these are unique; no spun articles. I have some expired Web 2.0s with good metrics that I want to use as Tier 2. My question is how many Tier 1 Web 2.0s can I link from a single Tier 2 Web 2.0? Is it safe to link 2 or 3 of my Tier 1 sites from a single Tier 2 site?