Underneath questions on Stack Exchange sites there is a "share" link which allows one to share the question one is viewing on Facebook, Google+, or Twitter. Is it permitted to use this feature on Mi Yodeya if one has non-Jewish contacts on these sites? Does this violate the dictum of the gemara in Chagiga 13a which states "אין מוסרים דברי תורה לעובד כוכבים" ("one may not teach Torah to idolaters")?