This is why I like cruising twitter sometimes.
You will see perfect examples of a good thing in action.
Take this tweet for example:
This is the founder of Stripe responding to Andrew Hyde, will admit also reasonably famous, saying he could help Andrew with a tech issue.
Patrick could have waited for someone else to respond but I am sure he knew that responding right when he saw would delight Andrew and practically anyone who saw the interaction.
No wonder Stripe is so successful.
Customer service is one of the best forms of virality on the planet.