Facebook, Twitter, LinkedIn—these are the darlings of the content marketing and social media worlds. It is Tumblr , a network ideal for photo and video integration , as well as reaching out to a niche demographic. Tumblr boasts 39 million users , half of whom are under the age of Since the bigger social networks have more varied demographics, it offers marketers a chance to connect with a defined audience. And because photos and videos are proven to be more engaging than text online, this micro-blogging site is the perfect place to connect with users on more than one front. With the introduction of ads that appear as highlighted posts , as well as the fact that Adidas just ran the first-ever large-scale brand campaign on the site, Tumblr is likely to keep on gaining traction and influence.