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Multiple questions about which links to disavow:
1) If a link is already nofollw, does it really need to be disavowed / removed?
2) If a link is on a page that is "noindex" does it really need to be disavowed / removed? (for example, a forum profile page.)
3) If it is a legitimate link (meaning we had nothing to do with creating that link) by some poster on a forum, but the forum is not really related to our site (although that individual page is somewhat related), does it really need to be disavowed / removed?
4) Do we need to disavow the hundreds of sites that scrape google SERPS and link to us?
5) If a link to our site is on a "links page" on another site (which links out to a dozen or more sites besides ours), does it really need to be disavowed / removed if the site is related to us?
6) If a link to our site appears sitewide (such as in a blogroll) on a site that is related to us, should it really need to be disavowed / removed?
7) Is it ok to upload disavow files in stages? Or is it best to do it all in one shebang?
"Google also seems to be not clear on how much effort it requires webmasters to demonstrate in link removal or 404/page removal. This is painful and often expensive, indeed not possible."
Will a domain disavow “domain:website.com” address all subdomains too
Q: Can I disavow something.example.com to ignore only links from that subdomain?
A: For the most part, yes. For most well-known freehosts (e.g. wordpress.com, blogspot.com, tumblr.com, and many others), disavowing "domain:something.example.com" will disavow links only from that subdomain. If a freehost is very new or rare, we may interpret this as a request to disavow all links from the entire domain. But if you list a subdomain, most of the time we will be able to ignore links only from that subdomain.
[edited by: Robert_Charlton at 9:58 am (utc) on Jun 26, 2013]
[edit reason] no domain names - read charter [/edit]
If a link to our site appears sitewide (such as in a blogroll) on a site that is related to us, should it really need to be disavowed / removed?
"To be honest, I am now completely confused about when its appropriate to use the disavowal tool other than 1) dealing with negative SEO and 2) reversing you own spam links."
"Therefore you should wait at least two weeks (?) after deleting before disavowing."
"While it's really important for the web-spam team when processing the reconsideration request to see significant effort put into resolving the issue at its roots (on those external sites), it can also be a good practice to at least have those sites listed in your disavow file in the meantime (use them in parallel, don't get bogged down with contact requests before adding them)."