Hey, thanks for the info. I wrote my provider to solve the problem. About the twitter provider, I saw the post from SoftCreatR, that he will stop the support for his media provider. I will publish a new version with a alternative provider.
His PIP-Plugin helps me. When you deinstall my collection you need to delete all providers manually. Thats the problem with media providers. His Plugin change the sql-table. So when i use his plugin as required the problem isn't anymore. I'm still continue my plugin. I will only change some things