1. Helping chemists find jobs in a tough market. 2. Towards a quantitative understanding of the quality of the chemistry job market.
As was pointed out in the xkcd forums, these are Euler diagrams, not Venn diagrams.
Did anyone on the xkcd forums realize that no-one cares?
How about this: People who think there is a shortage of STEM candidates/Medicinal ChemistsBitter? Perhaps.