since a profile page uses its user's id instead of username in its url (obviously a good choice since it allows you to change your username & not mess up any pages linking to you) user search is your only way to find someone if you're not in contact, but it doesn't work so well if you're looking for someone w/ a short username.
below is what it currently looks like when i search for @/You:
now, it's definitely not unmanageable. yet. but our number of users will only increase, and it would be a good idea to future-proof it. (alternatively, it could be alphabetized instead of ordered by id, so you just have to scroll down to where you know it is)