Like other users, Google desindexed my MFA sites (for example www.obsidiana.info) Somebody knows how i can avoid it for my new sites?? Thanks!
Yeah, I think you might actually have to put some work into your sites instead of just slapping Adsense ads around a few paragraphs of content. Also, I have trouble reading languages other than English, but I'm pretty sure Google frowns upon your overuse of the word "obsidiana." You've used it 14 times in 2 paragraphs.
With a site like that, they are going to ban it. It's just a question of when. The trick is to make as much money with it as you can before they do. Add some more content like RSS, SERP scrapings, and markov for "original" content (look it up if you don't know what that is). Get lots of links.
Original content updated frequently with well placed but conservatively placed ads will keep you from getting banned.
Work on your site content and build links from relevant websites then you will be fine, Don't go with duplicate content and MFA sites.