In honor of Twitter’s fifth birthday, Nextbook Press is challenging readers to Tweet a fundamental description of Jewishness. After all, they note, Hillel’s famed definition—”What is hateful unto you, do not do unto your neighbor. That is the whole Torah, all the rest is commentary. Now, go and study”—comes in at a slim 127 characters, including the punctuation.

So, go forth and tweet! And don’t forget to adorn it with the hashtag #on1ft (that is, the fashion in which Hillel claimed he could teach Judaism to anyone). If you have room to spare, @NextbookPress it, since Nextbook Press after all recently published Joseph Telushkin’s book on the great rabbi (if you have even more room, @tabletmag it, too).

#on1ft Challenge: Tweeting Judaism [Nextbook Press]
Hillel: If Not Now, When? [Nextbook Press]