This is the little bit of a grey place in Web optimization: Google’s Look for Central documentation states that “​​any links supposed to control PageRank or possibly a web site’s ranking in Google search results may be viewed as part of a link plan and a violation of Google's Webmaster https://www.seoclerk.com/private-blog-networks/1025533/POWERFULL-PBN-1000-Web2-0-300-Directory-500-Wiki-500-Forum-Profile