Have you sensed the sudden interest in expired web 2.0 properties? It seems that recently SEOers have been finding new uses for these properties which at one time were just used to pass link juice in link pyramids. But no more are they just used for that.
It turns out that they're an essential ingredient if you want to build your own PBN, with web 2.0 properties rather than standalone domains.
Why not look into [url=http://www.konker.io/services/9931-i-will-find-and-register-an-expired-tumblr-blog-with-high-trust-flow-20-tf20]expired tumblr blogs
[/url] for your PBN?
Imagine the extra attention google would toss upon your web 2.0 PBN if one or more of them were trust flow 20 from the start.