It used to be that when I posted on this forum, the Fedora icon would appear on the top right side of the post. Starting some months ago my posts have just the generic penguin, and I only use Fedora to post. I am not sure if this is a bug or a feature.
Update: how does the forum know what OS is someone using? By a string provided by the browser? If so that may be the explanation. I used to use Firefox packaged by Fedora and now I am using FF that I built myself from upstream sources.