Ah. Just found out that I was user no. 4449 on Ello, while e.g @anna is no. 81 and @lucian no. 2. I came late by 5. Arrgh.
So who is no. 1? You guessed it.
Find out your individual number yourself:
In Firefox use either the Inspector filed under "Tools" or do a right click on your Ello homepage and choose "View page info". There you'll stumble upon a cloudfront.net-source with "user/avatar/" in the path. The number right after this is your id.