For this question here, How can international students with weak work experience overcome logistical difficulties in seeking work in the United States? , I am unable to tag users as I want to reply to the user who posted the second answer with a clarification.
Typing the @ symbol and the first few letters of his name, does not trigger the autocompletion request. Manually typing his name after the @ symbol does not work either as after I hit save, the @symbol followed by the user name disappears. Could this be a bug?