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1. Doesn't matter as long as you update frequently
2. No exessive interlinking on the same IP but you don't need different class c IPs for every domain (lots of sites are on shared hosting, there is no way that google would start banning domains that fast).
3. Just don't do heavy spamming and you won't have problems.Getting 30 IPs without going to different hosters should be hard tho even if nobody really enforces the RIPE rules for IP allocation.
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