Facebook and instagram were both started as a social media platform but due to their marketing value they have evolved into commercialized business concept that focuses more towards adds and revenue generation.
Growing from understanding the socializing need to a hot burning cake of revenue generation facebook has evolved itself in variation of changing its look and appearance.
Getting into people's lives of creating a habit of understanding user behavior and pattern, the organization has gone through various marketing strategies. Just like any other business life-cycle of any organization facebook and instagram has seen its boom. I believe there has always been a replacement for everything.
If you look at the trend then social media has been changing from MSN to Yahoo to HI5 to orkut to various other social networking sites. All of them have seen their top level to bottom point. I think its just a process of evolution and humanity where people practice dynamism. People always want something new that excites and enthralls them.
The commercialization of Facebook has taken its toll and it has evolved so much but now when technology is also growing and people are also getting fed up with all the nonsense and garbage things happening. I think there would be more attacks and securities threats targeted where it needs to face them. I think its people's choice and want that we all need to respect other than that anything rarely matters
One thing that I know is people love their freedom and no-matter what facebook or not I thing the world will exist and it will be better as the future new option of social media are evolving.