Im just getting started with it but I hear 70% of traffic is women, and its getting larger so I think it will be something that will definately take off soon.
I was gonna try to spent some time on Pinterest, but I think it is unnecessary after seeing your post. I want to know how do you manage your twitter business. I don't think people will read your posts if your posts are always about your products. It didn't drive much traffic to my site as I have kept running it for more than half a year.
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I don't think you can spend more time on Pinterest. You can spend as little as 10 minutes a couple pinning photos or images.