FWIW I'm not super sure that dating online hasn't fooled some into thinking they're shopping for a product, not trying to meet people. Real people, with flaws and scars, looking for others with good energy.
Anyway, I did the San Francisco roommate thing for six months. It was a mixed bag and I have stories, pretty much all you can ask for. It's a great city! It's also broken and overpriced, so I live down the peninsula now. It's a little slower but I'm turning 30 and know enough to know I need my space. You do what you have to do.
Young, self-aware, creative workaholic sums me up, I think.