1. registrar does not matter
2. different dns servers(unique ip's) if possible or use registrars dns system
3. different ip address for each site
4. sites registered on different dates (the more time between them the better)
5. if you can, don't use private whois but use different contacts for each site
6. different content )
7. different google accounts if you use adsense/analytics/webmaster tools + different browsers / private browsing / proxies ( watch for cookies )
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