In this age, those three words are wrongly used. After a week of dating someone, you can't just begin to say "I love you" - you probably hardly know them. It's more likely lust that you're feeling, not love. I mean, I don't know what it's like to feel lust or love but it just seems ridiculous that the word "love" is used so soon.
Also if you're dating someone, don't go on Facebook every day and post on your boyfriend/girlfriend's wall "I love you so much" followed with a million hearts or put it as your status. Keep it to yourselves. It pisses the rest of us off - we don't really want to see it.