I think you're right about wanting to expand your social circle - it's a great step forward from the loneliness. When I first separated from my ex husband that loneliness was a killer - I had no one. I consider myself to have one genuine friend - but even with her I see her so occasionally because we live so far apart.
From experience yes I did the online dating and that's how I met my current partner but I think you might have to bounce between a few trolls hanging out on the internet first lol - but definitely worth a shot.
Are there any sorts of clubs in your area that you could join?