Hit ENTER after each Tag to add it to your post; Numbers in parentheses represent the Tag's usage.
When composing new message in Safari 7.1 on Mac the Enter key does not advance into new line. it goes back to line beginning instead. When Enter pressed in the middle of the word it does advance to new line below. It's been confirmed with 3 Mac users with Safari 7.1. Other browsers on the same OS work fine.