☼ ♥ ✈☺♬. Want these smileys in your tweets? TwitterKeys fills your tweets with graphics. It has a UTF compatible set of characters which can be used as smileys for your tweets. It is targeted towards Twitter users, but the characters also work on Facebook. This means your conversations wont be composed of just plain text anymore. Using it is very simple. Just select any character and then copy and paste it in your Tweet. TwitterKeys can also be bookmarked for easy access to the characters. You can do so by dragging this link to your bookmarks toolbar: TwitterKeys.