I have purchased 4 domains with PR 3 but after some time 2 of the domains were deindexed by google

Hi
I have purchased 4 domain from Godaddy Auctions, each domain have PR 3. I have installed wordpress on 2 domains and added some blog posts (unique content) but after few days google have deindexed both domains.
Can anyone tell me what was the problem ? and what I should do with the remaining 2 domains as I haven't started working of those yet

See original post by sara malik