This undermines the usefulness of the Twitter feed's landing and emergency notifications. If people stop paying attention to Twitter, which they will, they will stop seeing these messages which is horrible. The only disadvantage of Twitter is....ads, and shorter tweets...but it an't so bad....a thought anyway.
Ed, good point, but since the advent of text messages have you stopped reading your emails? Probably not since they both serve a different purpose, whatsapp group chat serves a different easier purpose then twitter for group messaging but not for gps tracking.
Since we can't get your gps tracker / spot location on whatsapp you and everyone else should keep a reminder to check twitter to see where folks landed. I think twitter will be very useful for when you are not connected to a cell tower 95% of the time, like being in the mountains. I used to have my tweets notifications turned off because of all the traffic from members tweets, now that it's limited to just landing out I turned it back on. I still check it as I'm sure others will too, I also constantly check Dave Wheelers xc find website to track peoples flights and see where they land so there's always that application to finding folks. I think this is better then twitter but not everyone is hooked into that system so I have to check both.
We really need to push more pilots into having a some sort of gps tracking system and not only rely on a cell based system like whatsapp. Yes, it is totally possible that many folks may say that they don't need a gps tracker like spot because I can send my location via whatsapp. So, we need educated the point that a gps tracker is great for when you are unable to text due to loss of cell service (which will happen), your battery died on your phone, you crashed and can't get to your phone in your back pocket or harness or worst case you are left unconscious, these points to keep or purchase your first gps tracking device need to be pushed as just another form of safety communication, keeping the link like twitter needs to be kept and will work as long as people like you and I keep using it.
There are so many different forms of communication and yes some may just go away in time due to better and easier ways. So far we have 43 participants with the Lookout whatsapp, just check it out and see what you think...