I imagine they can detect incoming traffic originating from other domains too.
If I click a reddit link on here they can see it and flag any account im logged into at that time.
I'm not 100% sure on whether Reddit itself has access to this information. I think their advertisers might do if they're running tracking tools and cookies across multiple sites but I think reddit only has anonymised data for those things. Internal traffic is tracked though so they know when your account visited x thread from y link internally. They have a full picture of internal brigading from subreddits.
They probably log it as "from external referral source" or paraphrase.
Browsers do generally send a "referrer tag" actually telling Google Analytics etc. where the user came from. Privacy settings often block this, but most people probably don't have it blocked.
I imagine they can detect incoming traffic originating from other domains too. If I click a reddit link on here they can see it and flag any account im logged into at that time.
I'm not 100% sure on whether Reddit itself has access to this information. I think their advertisers might do if they're running tracking tools and cookies across multiple sites but I think reddit only has anonymised data for those things. Internal traffic is tracked though so they know when your account visited x thread from y link internally. They have a full picture of internal brigading from subreddits.
They probably log it as "from external referral source" or paraphrase.
Could be wrong though. Worth keeping in mind.
Browsers do generally send a "referrer tag" actually telling Google Analytics etc. where the user came from. Privacy settings often block this, but most people probably don't have it blocked.