Instant Articles is a mobile publishing format that enables news publishers to distribute articles to Facebook's app that load and display as much as 10 times faster than the standard mobile web. This link will explain you better:- https://blog.bufferapp.com/facebook-instant-articles
Instant Articles is a feature of social network site eg.Facebook for use with integrated news and content publishers which can be chosen to use for article they select. When article publishers select an article for instant articles, people browsing Facebook can view the article from Facebook app.
Use web 2.0 sites to create blog. Instant article sites are not good. Web 2.0 sites are always good to get high quality links from high authority sites.
Trying to solve slow loading times on the mobile web, Facebook created Instant Articles, a mobile publishing platform that allows customers to publish their stories swiftly. Publishers have control over their data, content and their ads. Once you've joined them, you can choose which page you’d like to activate articles for. After the page selection, you’ll be asked to provide a URL you would like to use for articles, and that will become the basis for the URLs of all your future posts. Once you have done that, you’ll be able to create articles, and subsequently design your own articles with fonts and logos that you prefer. The last step that needs to be completed before you can start using Instant Articles is submission of your feed (Facebook needs to verify that all articles generated from your website are properly formatted).