I have been a facebook user since 6years. This website is really a nice hobby. Moreover its creating a platform to interact via sharing pictures, links, status etc.
One of the intresting fact that attracts the users is it updates its app and website frequently, like when I joined facebook, that was in 2009, it didnt had the fb cover concept.
Facebook pages are also easy to create and are becoming a hobby. Lastly, facebook has many other features ( like groups , setting targeted audience for status posts etc) than twitter or similar sites which provide it an edge over them.