I Am Sam Altman, President of Y Combinator.  AMA
Question re solo founders:
"A startup is too much work for one person" and if you can't convince even one friend to join you, that doesn't speak well for your idea! On the other hand, a bad hire/partnership can ruin the company. YC gives signal it really prefers to look at teams than individual applications.
Q: Do you have have advice or rules of thumb re how much time a solo founder should put into finding partner(s)? Or thoughts re how much to prioritise this, vs. just writing code and talking to users to finish initial version yourself? 
I don't mean this to be just focused on "getting into YC" but more in general: what's the right way to think about fixing this problem (being a solo founder) vs tackling other things like actually building something initial users can be using? For software ideas surely it is occasionally sensible to make at least a prototype and actually get some users before ever buddying up? Or if I've got this far but am basically still going it alone, am I doing something wrong?