Facebook contains useful updates and information not present on my website; usually in the form of video links.
Twitter contains more on-demand updates and useful interactive polls if the need is ever presented.
Amazon Author contains my author profile used to experiment with which books perform well; most books are for free and I am not considering querying them to a traditional publisher/agent.
Reddit takes the form of three identities: the first is more personal updates in u/MMonasterio, the second is for general updates on r/MMonasterio and the third are individual subreddits for my novels. r/SuperbMrAlbertLiber is one example.
YouTube contains video updates of either music performances, or novel releases and or ideas. All comments are welcome.
LinkedIn is used especially for individual qualifications, for example my training and education. literary agents, publishers, copyright personal and employers would use this section most heavily.
Google+ was another method of releasing updates. However, following its removal in 2018, it is more of a relic. Hence the bottom most placement.