Thanks for the articles, all very good reads. Personally I think social interactions in general, even with other species (humans for example) has an impact on the behavior of the chameleon/reptile. But I also think it's situational.
For example I think the more aggressive chameleons are of course the ones housed together because they're fighting for food, sunlight, their own territory, etc. So they're always on so to speak. Where as the one in isolation has no one to compete with so it wouldn't have to eat as fast and such and since it's alone more often than not seeing another chameleon could give it the passive "I'll just submit until I'm back safely in my neck of the woods attitude" because it never had to learn the take what you can get aspect of living.
As far as social behavior being learned from human interactions goes, well we all have chameleons or a reptile so you can clearly see what the results are. Some people have really aggressive chameleons that eventually let them handle them for moments at at time, some never do, and some don't mind being handled at all. Each one is situational to the environment it's put in, what its environment was like beforehand etc. allowing it to form positive or negative social behaviors.
Idk. That's just my opinion. Haha. I guess these articles just got me thinking.