  Must we trace and block all fake content in a social commerce network so that
genuine users may enjoy fake-free information? Such efforts largely fail,
because, as we get better at spam detection, spammers use the same advances for
anti-detection. As a fundamentally new approach, we show that an online
platform can aggregate and route user-generated content in a smart personalized
way, which fosters and relies on "collective social responsibility". We
introduce the notion of information aggregation domain, or simply, domain:
composed for a given "central" node (user account), a domain is a connected set
of nodes whose user-generated content is eligible to be used to meet the
central node's information needs. Admitting malicious information sources -
"bad citizen" nodes - into "good citizen" nodes' domains puts the good citizens
at risk for disinformation attacks. We show how a platform can limit this risk
by exploiting the social link structure between its nodes without the need to
know which nodes are good or bad citizens. We introduce Relaxed Clique
Percolation (RCP), a class of policies to compose personalized
disinformation-resilient domains. Then, we define "RCP cores" and show how they
can be used to efficiently compose resilient domains for all network nodes at
once. Finally, we analyze the properties of RCP domains found in real-world
social networks including Slashdot, Facebook, Flickr, and Yelp, to affirm that
in practice, RCP domains turn out to be large and spatially diverse.
