To get credit for reading quality articles students have to use the Stackup Chrome extension. When it is enabled the extension tracks how much time students spend on a relevant webpage and how many relevant webpages they've read. In their Stackup dashboards students can see their progress toward completing a challenge and they can share their reading data with you.
Applications for Education
Stackup could be a good tool for high school students to use to prove that they have read content related to topic that they're studying in your classroom. I think the best use of Stackup would be in a social studies class in which students need to follow current events for classroom discussion.