What is Instagram? Just as its promotion words:  A simple, fun & creative way to capture, edit & share photos, videos & messages with friends & family. With the prevalence of smart phone, Instagram is the fourth subsidiary of Facebook to continue Facebook , WhatsApp and Messenger with more than 1 billion monthly active users. It is very popular, especially among young people.People Create an account or log in to Instagram is not only on a purpose of expressing themselves, sharing their diverse, unique life or seeing what's new from others all over the world, but also seeking business opportunities. In order to satisfy buyer's need of high quality but low price products, some clever businessmen share some clear pictures of their products. For example, fashion silicone Phone Case is a extremly hot selling item on Instagram.Why fashion phone case can meet such a big success? I am not sure the factors of success that I sum up is 100% right, however, I believe that no one can success accidentlly.The first and most important factor, as far as I am concerned, is the large amount of active user on Instagram. These smart bussinessmen saw the bussiness chance of large data flow and sell their products all over the world. There are a huge market. Even there are only 0.1% Instagram user can see your products,  you will meet with a great success.The second reason why silicone phone case can be a hot selling product is that there are a great demand of phone protective case. With the popularity of smartphone, mobile phone play an increasingly important role in our daily life. Nowadays, for most people, wherever they went, cell phone is the “must ” thing.What's more, another important reason is their innovation. As we all know, many people buy a phone case not only on the purpose of protecting their smart phone but also to express their personality. Most Instagram users are young people who want to be fashion and unmatched, so the most hot selling phone case is always in a unique shape.You can't image how popular a unique silicone phone case will be. Some crazy fans can wait a new special phone case for several weeks.