When I was idly browsing this site, I found something odd: someone, posting a link to TV Tropes, considered it necessary to explicitly warn people that this is a link to TV Tropes:
You need an Applied Phlebotinum (warning: TV tropes link) to explain why this superpower is real.
This begs the question, are TV Tropes links unwelcome here so that one must warn others if their posting such a link, and if it is so, then why?