each of those page on tumblr have thuge number of obl , that too with diff anchor tags including money making, poker, and hell lot of niches.. so google will consider that page as a link selling farm and wont give you a good external juice
clar nu obtii valoare prea mare dar poate in schimb obtii PR mai mare , ca am vazut ca se mai vinde si pe aici advertoriale pe site-uri cu cu PR6 si nu intelegeam cum ajungi la performanta asta