According to this article Craigslist sites are generating 3 billion page views every month and running more classified ads than all US newspapers combined.  According to Craigslist CEO Jim Buckmaster the biggest problem they have is keeping up:

"We struggle to keep up. Last year overall
growth was 200 per cent, both in terms of page views and listings – and
if it pools to 100 per cent, we would be happy with that."

I can think of a few newspaper people who would LOVE to have that problem.