Want to file a reconsideration request with Google? Few weeks ago, my site almost disappeared from Google after a penalty. The search rankings of all pages dropped way down in Google search results though the site was not entirely banned in Google.
When someone posts a link on Twitter, it is automatically converted into a short URL often powered by tinyurl.com. Human visitors can click the tinyurl link to visit the underlying website but that may or may not be the case with Google spiders.
Google AdSense ads will make an appearance in Google Image search very soon. This is not a clear screen capture but should give you an idea about how well Google has managed to blend advertising in image search results.