|When politicians make clearly false claims, reporters have an obligation to explain to readers why those claims are false--or at least quote someone who can. I would suggest political scientist Jonathan Bernstein:
Very simple: anyone who says that Social Security is a Ponzi scheme either misunderstands Social Security, misunderstands Ponzi schemes, is deliberately lying, or some combination of those...After all, a Ponzi scheme is a deliberate fraud. Saying that Social Security is financed like a Ponzi scheme is factually wrong, but saying that Social Security is a Ponzi scheme or is like a Ponzi scheme is basically a false accusation of fraud against the US government and the politicians who have supported Social Security over the years.
...But I find that charts often make understanding things easier, so here's a Venn diagram I made that explains some of the differences...