In this edition of the WebAgency search and social media roundup, read about a new Google Analytics cookie, Facebook testing instant videos on mobile and more.

• Google Responds to Apple’s Intelligent Tracking Prevention with AdWords Tracking Update (Search Engine Land)
• How to Create Engaging Social Media Content That Can Drive Results (Search Engine Journal)
• Facebook Tests Data-Friendly Instant Videos on Mobile (Search Engine Journal)
• Account-Level Ad Extensions Now Available in Bing Ads (Search Engine Land)