Default text in categories Soicable more…

Sorry for double posting, but I think I posted it in the wrong thread last time:

I have several questions:

1. Is it possible to have a default text in posts within one category? Or is it some easy way to put the same text into a selected post without doing the copy/paste thing (like if you’re not on the same computer when you post)?

2. Can somebody please tell me how to remove the line below the logo on my site https://www.waddledee.net? I can’t for the life of me find the error.

3. I have the Sociable plugin installed, but something in my theme CSS is making the pictures into some kind of bulleted list. How can I remove the “list”? (Example: https://www.waddledee.net/?p=1464)

Any help is greatly appreciated!