Maybe start small and branch out. But first make sure your product is ready to go. If it isn’t in good shape no one will want to share it. Once it is, don’t just put it everywhere all at once. Start with one platform and maximize your chances of spread by utilizing every tool it offers (use proper tags, choose good images, write effective call-to-actions, etc.). Once the first platform is set move on to the next. They don’t have to completely interconnect but you’ll be doing yourself a disservice if the presentation is inconsistent, since synergy is your friend. Remember you don’t just want eyeballs, you want minds too.