There are very many sites out there which collect statistics at various levels. e.g. scorecardresearch.com, doubleclick.com
Some of these (claim to) only collect 'anonymous' data, others collect more private information. There is no current category into which such sites can be accurately put.
Blocking such sites probably requires the 'silent block' feature which other people have already requested (and I strongly support) since the access to them is not triggered by the actual user but by some other allowed site.
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