Dear Facebook, Just Wait, One Day They All Will Leave You Too! Sincerely, Orkut Dear Optimist, That's Not A Light At The End Of The Tunnel, But A Train! Sincerely, Pessimist Dear Icebergs, Sorry To Hear About Global Warming. Sincerely, Titanic Dear Yahoo, I've Never Heard Anyone Say, "I Don't Know, Let's Yahoo It!" Sincerely, Google