If you’ve been using Instagram for a while, you would be aware of a very successful (and often very beautiful) account called Humans of New York. The Insta account has now grown to include a web page, Facebook page, and a book. It’s also spawned possibly thousands of storytelling sites just like it.
As with any creative pursuit, it’s hard to become a great practitioner unless you look at other people’s work. By far the best way to learn to write well is to read a lot (and then write a lot). It’s exactly the same with singing, dancing, painting and … photography.