If you are active daily on Reddit, you can (and should) put your url in your flare beside your username (same way how SBI forum puts our url in our username, but it doesn't direct click to our site, you have to copy and paste it instead.) It's a non-clickable text, so doesn't link to your site directly, people have to copy it and paste it into the address bar. I'm a heavy Reddit user, I post daily on more than a dozen subs. Several not even on topic to my site, but rather just subs I'm a member of because of various hobbies I'm active in (mostly video games.). I post maybe 10 to 30 posts a day over the course of my chatting with my Reddit fam (Possibly more actually... some subs are kind of chat-roomy, so posts start adding up fast in back and forth conversations.)
And I also get 200 to 400 visits to my site every day, from Reddit, without ever doing any spammy link posting in my posts. But I've been on Reddit 6 years and have thousands of posts over there too, so that might make a difference.
Here's what it looks like...
Not every sub allows flair though. You'll know if they do or not. If they don't allow it, they have the feature turned off.
If they do allow it, a little link that says "edit flair" will show up beside your username. You just click that and type your url in it.
You have to set up your flair separately for EACH sub you join.
You can also create a profile (it's in Beta right now, so you have to contact Reddit directly to request signing up for the Beta program. It usually takes about an hour to get approval) Once you are a Beta tester, you'll have a profile page that lets you pin a link to your website right front and center on your profile page. It's expected to go live to everyone this summer. I'm not sure if the Beta program is still taking new testers or not.
And I know a lot of people make fun of it, but I actually get 50 to 100 visits a day from Google+
Tumblr brings in pretty steady traffic for me too.
LiveJournal is another good one, but very nich heavy there, kind of more for geeky teens, so, not a good fit for everyone.
MySpace is not dead and accounts for a small bit of traffic. It's pretty even with LinkedIn. Both are low traffic, but, low traffic is still SOME traffic.
Digg sends me traffic when I remember to submit my links to it. I could probably get more traffic from Digg if I could just remember to submit every page as soon as I published it.
Delicious, also, same as Digg.
Fabulously40, N4G, StumbleUpon, Yummly, FabDesign, Diggita, Care2, Newsvine, GoogleClassroom, ResearchGate, SurfingBird, Amen Me, About Me, Twitch, Itch.io, Steam Discussion Boards, YouTube, Fancy, Folkd, Memonic, Financial Juice, Blogkeen, Pocket, We Heart It, Exchangle, Kaboodle, Typepad, Blogger/BlogSpot (commenting on blogs I read/follow), HedgeHogs, and WordPress (commenting on blogs I read/follow)... are all others that I use from time to time, though some of these are VERY niche and might not fit every site, so you'd have to check each one out and see if any fit your site or not. I feel like I'm forgetting some, but those are all I can think of. I have so many social network accounts and I don't use half of them. Hard to remember them all. (Many of these are gaming related because I'm a YouTube Gamer.)
Reddit, Tumblr, Twitter, and Google+ are my top 4 traffic sources. Followed by YouTube, LiveJournal, FaceBook, Pinterest, LinkedIn, Digg, and Blogger.
Here are the links to my most used social network accounts, if you want to go look and see how I use them: