A matrix of who requested whom according to the HTTP Referer value. The dataset is the same german newspapers as in this article. For example, if one loads an iframe from safeframe.googlesyndication.com it will pull in all kinds of stuff from other servers and the browser will set the Referer to the address where the iframe came from.

You can filter and page around in this map. X = source, Y = destination.

*.fls.doubleclick.net
*.safeframe.googlesyndication.com
ad.doubleclick.net
adservice.google.com
content-texttospeech.googleapis.com
fonts.googleapis.com
googleads.g.doubleclick.net
imasdk.googleapis.com
news.google.com
tpc.googlesyndication.com
www.google.com
*.fls.doubleclick.net
71i.nuggad.net
a.twiago.com
ad-server.eu
ad.71i.de
ad.ad-srv.net
ad.doubleclick.net
ad.sxp.smartclip.net
ad.yieldlab.net
ad1.adfarm1.adition.com
ad13.adfarm1.adition.com
ad16.ad-srv.net
ad28.ad-srv.net
ad4m.at
ad4mat.net
ade.googlesyndication.com
ads.pubmatic.com
ads.smartstream.tv
adservice.google.com
adservice.google.de
adv.office-partner.de
aktrack.pubmatic.com
analytics-wg.webgains.io
analytics.webgains.io
api.theadex.com
api.webgains.io
apis.google.com
b197.s79.research.de.com
b78.s79.research.de.com
beacon.krxd.net
bid.g.doubleclick.net
bidder.criteo.com
brain.rvty.net
cdn.ampproject.org
cdn.doubleverify.com
cdn.flashtalking.com
cdn.jsdelivr.net
cdn.retailads.net
cdn.twiago.com
cdn.xplosion.de
cdn3.doubleverify.com
choices.truste.com
cm.g.doubleclick.net
code.createjs.com
content-texttospeech.googleapis.com
csi.gstatic.com
d.nativendo.de
de-gmtdmp.mookie1.com
de.ads.justpremium.com
des.smartclip.net
diapi.webgains.com
dmp.theadex.com
dsp.adfarm1.adition.com
dt.adsafeprotected.com
encrypted-tbn0.gstatic.com
encrypted-tbn1.gstatic.com
encrypted-tbn2.gstatic.com
encrypted-tbn3.gstatic.com
eur-ukp.adsrvr.org
eus.rubiconproject.com
fonts.googleapis.com
fonts.gstatic.com
futalis.de
fw.adsafeprotected.com
gcdn.2mdn.net
googleads.g.doubleclick.net
googleads4.g.doubleclick.net
gum.criteo.com
gw.geoedge.be
hal9*.redintelligence.net
htlp.eon.de
ib.adnxs.com
images.outbrainimg.com
imagesrv.adition.com
imasdk.googleapis.com
journey.unicef.de
lh3.googleusercontent.com
lh5.googleusercontent.com
log.outbrainimg.com
m.exactag.com
match.adfarm1.adition.com
match.adsrvr.org
mcdp-sadc1.outbrain.com
media.oadts.com
news.google.com
nugmw.userreport.com
ob.cheqzone.com
obs.cheqzone.com
odb.outbrain.com
pagead2.googlesyndication.com
partner.blau.de
partners.tremorhub.com
pb.media01.eu
pixel.adsafeprotected.com
play.google.com
player-feedback-v1.glomex.com
player.glomex.com
portal.blau.de
pr-bh.ybp.yahoo.com
pr.ybp.yahoo.com
*.fls.doubleclick.net
*.safeframe.googlesyndication.com
ad.doubleclick.net
adservice.google.com
content-texttospeech.googleapis.com
fonts.googleapis.com
googleads.g.doubleclick.net
imasdk.googleapis.com
news.google.com
tpc.googlesyndication.com
www.google.com