Planning a holiday or any form going away is always difficult especially if it involves picky friends and family. TripAdvisor is a good positive example of an online community as it
allows the audience to participate by writing a review on their experiences on restaurants, hotels and locations that they have been too. While also providing you with information, links and photos which the audience do to allow you to get more of a quick idea of the trip you could partake.
This is really useful if like me you are planning a holiday or a trip, the uses of pictures and real people sharing there experiences allows you to get a realistic approach to the experience you will most likely get. Also TripAdvisor is helpful and positive all these elements help when planning a trip away in a large group as they can get more of an idea of the location and public opinion.
One negative aspect is that TripAdvisor, is a matter of opinion and everyone has different taste and there own idea of how certain standards are meant to. So something i may count as a negative when planning a holiday such as lack of clubs or waterspouts and post a bad review with low marks someone else might consider that to be a positive element and post positive feedback and high marks.
So, really this online community should be taken from a generalized perspective not a biased mindset.