The industry I graduated from, which I held a job for 2 years, exclusively advertises through LinkedIn.

The jobs I held for other two years or so, in retail, were hell, but I got them through Seek.

The job I got, in retail also, I got it dropping a resume in person at a shop.

I used to work in a different field altogether. Those jobs I got through word of mouth.

So yeah, it depends a lot on of what kind of job you are searching for.