There should be a simple option to use "Page Previews" when hovering over URL Links, just like in Wikipedia.
When a Wiki/Blog reader hovers with their mouse over a URL Link, a small popup should display a content preview of the linked content. A content preview should contain a short summary and an image, if available.
Page Previews can significantly reduce the number of tabs being opened by a user, and hence enhance Browsing experience.
This page provides plenty of examples: https://en.wikipedia.org/wiki/Iceberg
A global Connections Administrator should be able to control whether the feature is available or not.
A Community Owner should be able to either disallow the feature or enable it per default.
A Community Content Editor should have a simple option (like a check box) to enable a URL Links for Live Preview or not.