Agreed.. in my view, Steemit is where you can 'invest' your time by sharing your thoughts with the rest of the community, Facebook on the other hand, is where you 'waste' your time by telling people about your messed up or amazing lives, people who have a whole lot of shit in their own lives to be too concerned about yours!
Both have their pros and cons obviously, but I don't think these two platforms can ever be competitors to each other.