Activision is not owned by GE. GE, NBC Universal's parent company, bought 80% of Universal from Vivendi in 2004, but Vivendi Games (Blizzard, Sierra) was not part of that deal. Activision Blizzard, the merged Activision and Vivendi Games, is owned mostly by Vivendi.
Bold, Font family, Font size and text color work, but nothing else. They appear in the WYSIWYG Editor and the formatting codes show up in the HTML Source Editor, but they are not there when I preview or publish a blog entry.