Official Google answer: Is there a minimum number of spam complaints about a domain and/or SERP before Google reviews the complaint?

Question:

Is there a minimum number of spam complaints about a domain and/or SERP before Google reviews the complaint? Presumably you get thousands of spam complaints daily, are these sorted into any order to be reviewed? The most popular first?

Google's Matt Cutts answers:

Summary of the answer:

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Question	Views
Will Google consider Yahoo! Directory and BOTW as sources of paid links?	1,090
Does Google see automatically generated content as a bad thing (i.e. spam)?	1,128
My SEO client is using shared hosting for one of their websites. When I checked other sites hosted on their server, I found some spammy websites. Will that affect ranking of my client's website?	974
What impact do site load times have on Google rankings?	932
How can a website compete for high rankings using only white hat techniques in industries that are dominated by spammers if Google takes months to react to spam reports and by that time new black hat sites are ranking?	1,099
A site for my client's competitor shows up on a SERP for keywords that never show up in the site anywhere (not even hidden in the source code). How is this even possible, and isn't this spam?	1,003
When permanently redirecting (301) a large number of domains (read: more than 10) to 1 domain does Google flag this as suspicious?	761
Does anyone at Google read web spam reporting messages?	685
What is the best way to check your own site for keyword rankings e.g. if I wanted to target a new phrase and wanted to check the progress of its ranking - what is the best way to check it?	972
Could you confirm whether the geographic location of the web host has any significant ranking factors for organic SEO?	962

Question

Views

Will Google consider Yahoo! Directory and BOTW as sources of paid links?

1,090

Does Google see automatically generated content as a bad thing (i.e. spam)?

1,128

My SEO client is using shared hosting for one of their websites. When I checked other sites hosted on their server, I found some spammy websites. Will that affect ranking of my client's website?

974

What impact do site load times have on Google rankings?

932

How can a website compete for high rankings using only white hat techniques in industries that are dominated by spammers if Google takes months to react to spam reports and by that time new black hat sites are ranking?

1,099