As news consumption shifts online, referring channels assume a growing role in the market for online news, creating new challenges and opportunities for news organizations. This research combines field and lab experiments, and analysis of large-scale clickstream data, to study the effects of social versus non-social referral sources on news consumption on a news outletâ€™s website. We propose that referring channels create a new type of priming effect, denoted the referral effect, as unique features of the referring channel affect user behavior in a subsequent news visit. We find that social referral effects manifest as more focused reading â€“ visits with fewer articles, shorter durations, yet higher reading completion rates - compared to non-social referrals. We further find lower sharing rates following social media referrals, likely due to a lower perceived novelty to peers of content discovered via social channels. The results provide insights applicable to news outletsâ€™ social media strategies.