Who do your need to thank?

It's so important for us all to recognise the help we receive from other people - so they know what they're doing matters!
I was so pleased to hear from 3 people I didn't know (and 1 I did know) this weekend thanking me for helping them through my free content. It's good to hear but it also means I know what I'm doing matters to them.
As Seth Godin says, you know your work is significant when you would be missed if you don't turn up!