Yes I think that Steemit will close the gap quickly on Reddit. In the end, Reddit has little to offer. Facebook is more formidable thought.
That said, my point with Facebook was at the moment. I do not know what the future holds and someone might develop an app on here that has many of the features of FB.....
Until then, FB isnt really on the radar....in fact, a write by the developers I read from the Spring talked about Reddit when they are discussing the communities idea.
Thus, I think that is the target...for now.