💡A Simple 6-Step Framework for Running Social Media Experiments (with 87 Ideas Included) 🌟 via @MarketingMuses 💫 marketingmuses.com ⭐️✨ http://bit.ly/2GUhKXA
gtag('set', {'user_id': 'USER_ID'}); // Set the user ID using signed-in user_id.
ga('set', 'userId', 'USER_ID'); // Set the user ID using signed-in user_id.