Google has recently added yet another offering to its diverse selection of content marketing tools: Gmail Sponsored Promotions (GSP). Using the same interface as AdWords, GSP allows businesses to develop email marketing that can target thousands (or even hundreds of thousands) of potential customers by placing ads right inside their Gmail inboxes! GSP is a fantastic link building tool because it lets you get really clever when it comes to developing strategies that build on your SEO and social media marketing to add immense value to your current email marketing strategy. How does it work? Google Sponsored Promotions appear as ads just above the first items in a Gmail user’s inbox. They appear as text that, when expanded, show...