Hmm ... we have no new threads now, so it's hard to get the full effect. 😃
But ... I like it! 🙂
...
If you should find yourself thinking the strings are still too long for the mobile interface, you could try doing this: replace the words "started" and "replied" with either a comma (before an "ago" expression) like so...
General UX, discussion list avatar mismatch
↖ Toby, 21 minutes ago
... or with a comma followed by the word "on" before a date, like so ...
General UX, discussion list avatar mismatch
wizgriz, on 27 Jul
That's not a request or a suggestion, merely an idea to keep in mind should you decide shorter would be better. (This makes it short enough that you could probably spell out the month names rather than abbreviating.)