I recently came across this low-quality post on Stack Overflow (Revision history link). The entire thing was made from a single link:
This gave me an idea for some heuristics which would block some low-quality questions from being posted. Questions which are entirely:
should be disallowed from posting. After all, there is no reason why a question should be entirely formatted like above — while you may bold your question at the bottom of your post and use italics for emphasis on certain words, no post should be entirely bold, italic or linked.