That might be true in the case of the first version of Instagram and Twitter. It was probably far from trivial once they had significant traction. Why do you th

That might be true in the case of the first version of Instagram and Twitter. It was probably far from trivial once they had significant traction. Why do you think no one copied them at the early stage? You'd think that Twitter with all their resources could have copied Instagram in a snap. Instead, when he saw the product and the traction, the founder of Twitter invested in it. He then got upset when Facebook brought them and is only now copying them.