Best places to buy data?

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Data is very important, it's up to everyone how they're using it

So what's the best places to buy it?

Similarweb - traffic
Ahrefs - backlinks
Builtwith - sites technology
 
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Apr 17, 2015
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The following applies to programmatic display advertising:

Audience targeting
- Eyeota (bees knees)
- BlueKai
- Bombora (great for niche industries)
- Factual / inMobi (hyperlocal targeting of mobile devices)

Contextual targeting
- DoubleVerify
- Sizmek
- Oracle

The above are available in your DSP, or a PMP could be set up for specific needs.