- ADL to Add (((Echo))) Symbol, Used by Anti-Semites on Twitter, to Online Hate Symbols Database. Joins Swastika, Wolfsangel, and Blood Drop Cross http://www.adl.org/press-center/press-releases/anti-semitism-usa/adl-to-add-echo-symbol-used-by-anti-semites-on-twitter-to-online-hate-symbol-database.html 14 comments politics