I wanted to get the blog URL of each posting, so that I can implement social media sharing buttons on each and every post.
After some research, here's the solution.
<%# HttpContext.Current.Request.Url.Scheme%>://<%# HttpContext.Current.Request.Url.Host%> <CSBlog:WeblogPostData runat='server' Property='ViewPostURL' />
As Community Server does not provide the full absolute URL of each blog post, the answer is to retrieve the solution in 3 parts.
In 2017, with the release of Delphi 10.2 Tokyo, Embarcadero introduced a specialized implementation of the Observer pattern into the System.Classes unit. While it has been in the wild for 9 years, it remains a "hidden" architecture for many, primarily because it serves as the invisible engine behind LiveBindings. Other than live bindings, you can also use the Observer pattern as a way to update component settings to the Windows registry, an .ini file, or persist it elsewhere.
System.Classes