But I promise that I will do all I can to help you avoid these mistakes. You can consult with me, borrow my style guides, give me drafts of your paper, and generally count on me to support your efforts to write properly. You might feel that these strict rules limit your creativity with the English language. I hope you'll understand. The media are powerful.
Television is a medium.
Television and the internet are media. Make sure that it is always a plural, and where it's not, make the appropriate correction. These words are possessive too, with no apostrophe. Which brings up the more general point of possessive apostrophes. If you wish to claim that something belongs to someone or something, then you'll probably need a possessive apostrophe.