I used to get work through word of mouth, occasionally from my own web site. Now I have an agency that represents me, they bring customers to me.

LinkedIn was always a bust for me, waste of time. If I'm going to spend significant time promoting myself I'd rather do that on my own web site rather than feed a database for web scrapers.

Sometimes leads or customers ask for my LinkedIn or Facebook (or Twitter) ID so they can connect. When I tell them I don't use those or any social media the most common response I get is "I wish I didn't use those." Anecdotally I know a couple of people who tell me they got leads and customers from LinkedIn, but more people tell me it's a time suck.