I've used Adobe Spark for a handful of projects and believe in the versatility and power of this application. First of all it is very easy to use. You don't have to be a graphic designer or web language guru to create amazing looking projects. For example, rather than a boring black and white resume, I used Spark to create a resume/portfolio of my work that helped me stand out from the competition. With a few quick changes I duplicated the same page and used it as a full portfolio of my photography and video work to shop to potential clients. I can't count how many times I got complements as to how the page looked and questions if I could make pages for others.
You can use Spark to create graphics for social media, Pages for web journals/portfolios/anything you can think of, and even video content with its on editor.
Bottom line this is a great application for content creators and multimedia people who either don't have a ton of experience in the creative suites (Premier, Photoshop, Final Cut, Illustrator, web coding, etc.) or those who have a ton of smaller projects to shoot out and need it done quick.
The best part is how affordable it is. $10 a month pay as you go or $100 for a year for the full plan and they even have a free option that allows you to use most of the features of the program to test it out. The free plan doesn't expire so if that's all you need definitely give it a try!