Haha... Well, I have some aces via cross pollination
I have a Tumblr and Google+ which I use carefully and, well, slightly aggressively. These both cross pollinate to Sound cloud a lot. I don't LOOK at my tumblr/Google+ feed much, but I hope those that follow me do (and clearly they do, as my SoundCloud plays prove!)
Tumblr allows embeds and "Reshares" which lets tracks go (mini)-viral very easily. I have gotten 100 plays in a day from Tumblr embeds alone. Just don't spam, or people turn off! Naturally.
Some people are concerned about such an approach. A follow/unfollow route. For me, it is all about getting the name out. I follow someone, they can ignore me or follow back. Its a gentle knock on the door, less intrusive than email spam and easily ignored. If they like the music they may stick around. I do something similar on twitter but ensure I stay following everyone that engages back. I have a cool group of followers on there. I also, probably have 1000+ followers on twitter whom I never speak to. But, they may well still be listening, and still become a fan in the long run.
As you say Alan, push in every direction! Avoid being rude, but a few tricks in my book are fine.
Try to target those that might care too. I aim for people that like artists similar sounding to me.
Next up. I have flyers and gigs to do. So times to get more REAL WORLD action that should generate some interest