I am on process creation local startups. The service is "question & answer" site.I plan to implement mention features such as twitter. The mention is uses the real username ex: @username. But I also want to keep user to use real name as seen on quora. While to implement @mention features using real names like quora I think is very difficult, because we have to check the user's id or slug on the server first. Moreover, when applied in mobile application it will make application running slowly. Are there any suggestions what approach should I do?