今非昔比物是人非
[jīn fēi xī bĭ wù shì rén fēi]
This online name conveys the sentiment of how things and circumstances have changed over time, yet some objects or people remain the same. '今' means present, '昔' means past; while '物' refers to things, '人' refers to people, and '非' means not the same. So, it expresses feelings about changes in situations and people but not in certain things.