adder - 8:57 pm on Mar 12, 2013 (gmt 0)
I would be very careful with these. A while ago I wrote a short PHP script that runs on a huge database of content-based website urls. The script was looking for HTML footprints left by Zemanta and I was able to identify several dozen of sites displaying their shared content box. If I can do this with limited resources, how do you think, can Google do it?
There is a non-reciprocating system called Zemanta that is better. You pay per impression to Zemanta.
@martinibuster, with all due respect, are you sure about this? Maybe they've introduced a new service but the way I see Zemanta is very different from what you described.
over 7m incidents of "Enhanced by xyz " in the Google search results
Exactly, that's a footprint that everyone can see. In addition, many networks also leave hidden footprints like <div>, <span> and other programmatically detectable stuff.
In my experience, Zemanta is a great way to assist in building a natural link profile. You provide them with a feed of content from your site, and they recommend it to publishers authoring "semantically relevant" content.
Yes, that is one of the products. You don't technically pay the blogger. You pay Zemanta for the facility. So, from that perspective, I gues it's ok.
But! There is another product where you put your feed into a large pool and your stories are distributed across partner websites. They get displayed underneath the articles as a block of "related articles". Is that safe? Well, because it is an HTML widget and the links are not nofollow, the short answer is no, it's not safe. And these links are not very high value either because they're hardly contextual. @martinibuster, if this is the product you were refering to, how would Google know that these links are PPC?
I have used Feedbox (double-check this, I'm not sure it's still whitehat because I haven't used it for a year) and Outbrain for blogs. Mind you, this is not money-traffic. More like browsing traffic, but if you sell stuff that appeals to lolcats and beliebers, you might get something tangible out of these networks.