This week’s WebAgency search and social news roundup includes stories on Google breadcrumb SERPs, Facebook testing of mass-send promotions and more.

• Google Introduces Breadcrumb SERPs (Search Engine Journal)
• Multifaceted Featured Snippets Begin Rolling out in Google Search Results (Search Engine Land)
• Facebook’s Testing a New Option Which Enables Brands to Mass-Send Promotions via Messenger (Social Media Today)
• Google Engineer Issues Warning About Google Crawler (Search Engine Journal)
• Study: 11 Voice Search Ranking Factors Analyzed (Search Engine Land)