On the benefits of over-long books.pic.twitter.com/r49KDsyWst
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
I used to notice this when I read the paper on which a book was based - I always remembered far more from the book. It was this observation that prompted my original tweet.
My use of spaced repetition has, however, changed this significantly; I now recall more from papers outside fields where I have expertise.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.