I found this to be a useful summary (thought I admit I don't know how accurate it really is): http://www.huffingtonpost.com/george-musser/space-time-illus...

> "String theory, loop quantum gravity, causal-set theory: these are just a few of the approaches that theorists have taken. ... But when you take a step back from the dispute, you notice all agree on one essential lesson: the space-time that we inhabit is a construction. It is not fundamental to nature, but emerges from a deeper level of reality."