I post a lot about inequality, and I think it's a huge problem, so don't jump down my throat for saying what I'm about to say (or do, but just bear in mind that I'm being a little bit devil's advocatey).
Net worth is tricky to think about. Take me, for example. My net worth is somewhere in the low six figures, or thereabouts. The median debt of a medical school graduate in 2012 was $170,000. Most of those people probably don't have any assests that outstrip that debt load. So, one could write a truthful headline that reads "b_b has higher new worth than bottom 50% of recent medical school grads combined." Would we get much out of it? Probably not, since my income is an immeasurably small fraction of the combined incomes of that group.
I guess my point is that we all know that inequality has gotten ridiculous in the last 30 odd years, and I'm not sure sensationalist headlines really do a lot for anyone. What we need are solutions. For the world's poorest that probably means (for starters) access to credit, rule of law, and guaranteed property rights and land titles. We could tax income over $1,000,000 at 100% here in the US, and it wouldn't do anything for the world's poorest 50% of people.