I guess the benefits are the following 1. Quick Indexing 2. Traffic Generation 3. Personal Brandinglisages 4. Quality Backlinks 5. Help in SEO
Most of the social bookmarking sites like StumbleUpon also give you the opportunity to develop your own page on their site. This is more like a more developed profile that you can use to list all your web pages, post links to your sites and even publish content on any niche that you may be involved in. In this way, you are not only submitting your pages to get one-way links to your sites, you are also branding yourself; you are establishing yourself as an expert to reckon with in your niche.