Prleap used to be pretty solid for keyword ranking purposes but they put the kabash on affiliate related sites. Im really suprised what prweb lets you submit. You could probably submit a pr that says, "Why PRweb sucks" and they'd still let it fly.
There are plenty of decent ones left but like BG said, you gotta do the research and testing to find what works best for what it is you're trying to accomplish, viral or temporaral serp ranking.
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I'd rather be surfing
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