3.Students can chat with peers, post a reply in a blog and contribute a comment to the let thread flow.

What tool it is or what app it is?

The tool or app that allows students to chat with peers, post replies in a blog, and contribute comments to let the thread flow could be a social networking platform or a learning management system (LMS) with integrated communication features. Examples of such tools/apps include Edmodo, Google Classroom, Canvas, Moodle, and Schoology.