I'm starting to speak to my guild on some of this and they are giving me some ideas.
Identifying Spammers and macro-users won't be easy and we would have to look at a lot of pictures to identify them. I think that is a good idea, but using the simple 1 - 5 star system, we would have to look at people who put 1 star for everything as well as those who do 3 stars, 4 stars, and 5 stars. We have to look at all users exploiting the system, and not just the ones who don't match the results we are looking for. To that extent, we should be look at least 20 photos to try to detect a pattern, and perhaps put a few control photos in there that are not disaster, and people would obviously rate as a certain way to exploit the spammers.
Far be it for me to tell you what your priorities should be and I would agree the plugin to be very important. To that effect, I realize that we are not a Guild and Enjin is for guilds, but the reason I recommended Enjin, so it could be a communication tool. Having just a google group won't be enough to get our message out, we will likely need several websites such as Enjin to create a community. It is easier to join a Enjin group than a Google group as people don't need to leave Enjin (which interconnects all pages) to look at IRL. Having a google group is still important, where we can take ideas from all these sites and put them here to look at what people have given us. We can probably talk to Enjin first and make sure they are good with us making a Guild page for our group to help reach out to gamers. While we will get a few people to find this group and join, to really get a community, we need to reach out for them to join us.
An idea that one of my members gave to me, which is either here or there but definitely worth discussing, is donations. That in order to participate, a person would have to donate money to the effort. Say minimum is $1 or $5. And all money goes to the specific relief fund. Once they do this, they then can participate. This helps prevent people from spamming us, as they would have to pay money just to participate, and we can still offer rewards and perhaps even a lottery for specialty items. We could probably setup a paypal sort of system. We would definitely need a License agreement, and it should state in there, if we find that you are spamming, we will block you and won't refund your donation (legalese it up). While helping direct where relief should be given or help works, money is very important. We do need to make it a small amount required, so even a 13yo who wants to help, can easily convince a parent to give them access to their paypal or credit card.