1998: as the first UK community and lifestyle site
Comment submitted by lankyphil
Huh - what about the original Fortune City? It might have been commercial but it certainly started out as a community site, with a great 'noir' theme / narrative, community elections, etc. By '98 it had been around for at least a coupla years.
Of course, dotcom made 'em turn into Geocities - but they're still one of the most overlooked British internet success stories.