Full Answer
When tracking runs client-side from external domains (facebook.com, google-analytics.com), browsers treat those cookies as third-party and restrict them. Safari ITP limits third-party cookies to 7 days, sometimes 24 hours. Server-side tracking through your own subdomain (track.yoursite.com) creates first-party cookies that browsers trust. Tools like Stape Cookie Keeper specifically extend first-party cookie lifetime. Tracklution and other server-side solutions handle this automatically. The result: longer attribution windows, better cross-session tracking, more accurate conversion data.
