Why are social media platforms connected to each other? Why is there a Facebook button in Instagram to share pictures? Should they not be independent?

No, because ov those people sometimes they joking, chating,liking, they are independent..to tell u the truth they enjoying life its appart ov life to take pics on facebook..why to take pics on facebook its apart of life because when he/she take apicture on facebook him/her becomes happy to be happy its apart of life not so...its not like they independent or not indepedent thats life its like game....??