The Swan orientation video implied that the "Incident" occurred because someone attempted to communicate by computer. Instant messaging is hardly a risky undertaking, so I have filed this information away, hoping for a morsel that would make this matter more believable.
Last night episode showed us that that Flight 316 arrived sometime in the 1970s. Dharma appeared to be just getting started (the van looked practically new). I am thinking the 316ers will be sticking around in this time period long-term. Jin appeared not only situated as a D.I. member, but indoctrinated too, as noted by his aggression. This implies time jumping has stopped for a long period of time--- weeks--- months. I suspect those on Flight 316 will ultimately join the D.I operations and live a decent chunk of their lives participating in the 70s/80s.
Here is where danger lurks. Any of the 316ers/Leftovers who existed on the island in their past during the 70s/80s have to be very careful not to run into themselves. Ben is one I know that will have this issue, as well as Miles. There will probably be others that are at risk that we just aren't aware of at this point.
I think eventually someone gets on the computer and tries to communicate, only they communicate with themselves, creating a paradox. I have no idea what will occur when this happens, but we have been told it is a very bad thing that must be avoided at all costs.