Well, according to Google's Distinguished Engineer Matt Cutts, which was shared by John Mueller, a Webmaster Trends Analyst at Google, webmasters should be tackling URLs for the disavow tool with a machete instead of a scalpel.
Multivariate Testing (MVT): Cutroni likes to compare MVT to using a scalpel – it's an opportunity to really fine-tune the pages and the content on your site once you start testing. If landing page optimization and conversion funnel testing are not...
It’s more time consuming, and takes more effort, but it may be worth taking a scalpel to your back links instead of a machete. Things that never used to "hurt" a website are now bringing businesses to their knees.
SEO Scalpel, while still in beta, is AudetteMedia's own tool. Some of the biggest problems negatively impacting SEO campaigns can be traced back to technical issues, since by nature they tend to hit areas around crawling, accessibility, redirects...
Tor users might not see the scalpel, if they have cookies disabled, from what I can tell. Google has a lot of engineering talent, but it approached this problem with a fireax, not a scalpel. Actually, Google is using both a fireax and a scalpel.
