In the world of academia, Valentine's Day can be a little more complicated than usual. You can't expect to get away by merely repeating the "roses are red..." cliche. You need to be specific. Why are the roses red? Which species are they? Which shade of red? Why compare them with violets? And why did you pick roses in the first place?

The hashtag #AcademicValentines crops up every year in the build-up to Valentine's Day. Scores of tweets pour in from all over the world, as people push their creative limits to infuse academic jargon into the season of love.

This year, too, social media has some unleashed some witty and geeky tweets ahead of Valentine's Day. Here's some of the best, with citations of course: