Advantages Web 2.0s vs. Private Blog Network

both must be index in google. its more important.
 
In PBN, we only create PBN that is related to our niche right? So if I have Android related blog on my main site, I should create also Android related PBN?
 
In PBN, we only create PBN that is related to our niche right? So if I have Android related blog on my main site, I should create also Android related PBN?
Not necessarily, but it helps a lot. I would recommend re-purposing domains you acquire to suit your niche, or at least e broadly relevant, example:

Your money site about vintage music records, PBN about latest music artists. Both are in the same broad niche - music.
 
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