Might not be a bad idea to have a Spotters Forum on PPRuNe, although I do agree that there are plenty of good sites for that already. Whilst I don't think PPRuNe is the right medium for announcing the next goodie inbound to Wherever, the spotting fraternity have at times provided useful or interesting info in so-called professional threads. Spotters should be welcome but I would ask them not to use this forum for the "what was the number of the Outer Mongolian Cessna 172 at White Waltham yesterday?" type of stuff.