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I would certainly recommend social bookmarking to sites that cater for your industry.

Generally you'll have to have a pretty catchy title and great content to stand out from the crowd though.
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With the current Smartphone market I don't think screens below 480 are going to provide a huge amount of traffic.

A mobile site can be great for certain applications, especially where you want to...

You can get backlinks both from your profile links and by sharing your links on peoples wall / tweeting about them etc.

More backlinks get created as more people share your content. So make sure...