Ossendryver, I have a HUGE respect for what you have done and achieved with the Sightings Applications.
I am not at all offending your endeavours at all. 
BUT:
I have today seen the carnage this can cause on Kruger roads first hand to a sighting reported on the App, from USV's nearly rolling the vehicles, to normal Kruger goers nearly killed by speeding Sightings users toward a pride of Lions. This is not speaking of the 2 dead Monitors, one seen driven over, a few dead birds(Francolin) on the way to the sighting. I do think that any subscriber MUST adhere to a code of conduct, maybe set up in your App. or some kind of rules.
Now this is not at all an affront to you and your work, but a call for some kind of control over the unruly behaviour of App. followers.
I hope this post is seen in the light it is written, and I do hope nobody will rip this apart and see it as an oppertunity to attack the app. But with something going this big, you are going to need some rules.
Otherwise, it is going to go sour. 
and scanning the veldt looking for animals and birds will become less?
But those who are prone to speed to the next Lion sighting, would anyway have done so using the pin up boards at camps, or popular knowledge of the best roads (case in point - the S100 speeders in the morning). The mentality of speeding to the next lion sighting has always been around. It is not technology that is the villain here.
