If I configure my neuron A to follow my neuron B, then configure my neuron B to follow someone else's neuron C, will my neuron A follow neuron C?

Yes, if you configure your neuron A to follow your neuron B, and then configure your neuron B to follow someone else's neuron C, your neuron A will follow neuron C. This means that when neuron C causes neuron B to vote, or if B itself votes, it will cause A to vote. This is part of the liquid democracy model that the Internet Computer uses, where neurons can be configured to automatically follow the votes of other neurons.