So some time ago I bought a fairly high PR site, installed Wordpress, and dripped in some articles related to the domain name. The articles ranked pretty well and Google was indexing changes within minutes. So, then I started adding articles with a link or two to my other sites with generally pretty positive effects. A few days ago my PR site wasn't visible in "site:" queries or other means. The only thing that was a little weird is a bunch of spammy looking links to my site had appeared on twitter and then the tweets were deleted within 24 hours. I thought it was probably a glitch but WMT eventually reflected no pages indexed, but there were no warning messages about anything. It occurred to me that what I was doing looked suspiciously similar to paid links. The footprint of the sites I was linking to was completely different. The irony is if I had made it more obvious they were all my properties, it's unlikely my PR site would have been deindexed. The thousands of links from Twitter might have gotten some attention from Google directed at my site which lead to the deindexing but there's no clear cause/effect relationship there. I don't think I'll do a reconsideration request even though I'm pretty sure it would work. The moral of the story is to think about how your site and links look to Google when you're building links to or from your sites. If it looks spammy or suspicious nothing stops them from dropping the hammer.