There's several off-the-shelf packages available that seamlessly run forums on desktop and mobile - Pprune runs on one.
The big mistake Key made was to try and write their own, presumably to save a few bob in licence fees.
I'm quite sure that sving has been long superseded by loss of income...
There was a lot of useful info on Flypast, an experience I always thought spoilt by some over zealous moderators...