I was recently contacted by a client who received a message in her Google Analytics account with the following:
"A significant portion of referral traffic to property Q4intelligence is from the following hostnames, which may be self-referrals:
"Self-referrals are referrals from pages within your own domains. Self-referrals can obscure the actual sources of traffic to which conversions and other engagement on your site should be attributed. As a result, your referral metrics could be inaccurate. Further, self-referrals could be indicative of improperly-configured cross-domain tagging. Your users could be generating a session per domain, which would artificially inflate session counts.