Those are ways to build networks. If you already have a network, they may not be necessary. Experienced developers with long work histories have networks throug

Those are ways to build networks. If you already have a network, they may not be necessary. Experienced developers with long work histories have networks through former coworkers and acquaintances. As you hint at the end of your post, that doesn't mean anyone can do without those things. If you're not at the point in your career where you have a large network built up, then you better set up the LinkedIn.