Copy names from the list and paste them into the IMVU People Search to see if the account is active.
Do not click on links within a text file that ask you to "log in" to your IMVU account, as these are likely phishing attempts. Download 70x Imvu txt
Many lists focus on names belonging to accounts that haven't logged in for years, which may eventually be released back into the pool. Copy names from the list and paste them