Not a source, WE'RE the source, Steemit's the venue for our positivity. It's only that good, but it IS that good.
I didn't witness its start with the high proportion of crap content last year (that much was posted about we can still read); LO AND BEHOLD! The designers, having designed in certain algorithms, and it self-corrected and -selected for quality, and HF19 looks like it's an inflection point of the curve towards a better human, maybe even trans-human, community. I'm 'borged now, and better for it.