How closely does MathOverflow track the interests of mathematicians as measured in other ways?

For instance, the Tags page here suggests that $$\frac{\text{interest}_{tags}\text{(algebraic geometry and number theory)}}{\text{interest}_{tags}\text{(algebraic topology and differential geometry)}}> 2$$

Would other measures, counting numbers of people or papers or talks, give similar results?

My guess is that MathOverflow gets a higher number for the above ratio than other metrics, since its format is more suited to things like 47867742232066880047611079 than to geometric diagrams.