Thrift module: significantsite

The Guardian website, including when viewed on native apps and
for pages served on non www. subdomains such as membership.theguardian.com
and careers.theguardian.com

An email sent by the Guardian, either one of our scheduled emails
or by a user clicking "email this"  *

An app push alert sent by the Guardian

Any google website, regardless of subdomain and country domain
i.e. includes news.google.co.uk and www.google.ca
also includes google plus?

Twitter, including any where the source was a result of going via
the t.co redirector

Facebook, including when we've inferrer that the referrer was facebook
because we were access inside a facebook native app.

Outbrain, both paid and non-paid *