Today we welcome the cloud computing event of the year, Dreamforce 2012.

If you're one of 90,000+ attendees, you'll be filling the streets of San Francisco faster than their famous fog. But don't get lost in the clouds because we're here to give you the most tweetable facts about this conference's bustling home.

Use these facts to impress your coworkers between Dreamforce sessions, start up a conversation at the Cloud Expo or yell them out during the Red Hot Chili Peppers concert. Or you can just click the heck out of these Tweet buttons.

1. Alcatraz was once a military fort.

2. The bay is considered the world's largest landlocked harbor.

3. San Francisco cable cars are the only moving National Historic Landmark.

4. Denim jeans were invented in San Francisco.

5. The Japanese Hagiwara family invented Chinese fortune cookies here.

6. 38 painters constantly paint the Golden Gate Bridge.

7. The Golden Gate Bridge has enough steel wires to circle the earth 3.5 times.

8. The Golden Gate Bridge is the world's second largest single span bridge.

9. San Francisco is built on 43 hills.

10. San Francisco is home to the American Antique Slot Machine Museum.

11. The San Francisco Opera is the 2nd largest opera co. in North America.

12. Pier 39 on the San Francisco Bay is home to sea lions basking in the sun.

13. In 1850, over 600 ships were abandoned in the bay.

14. It is 231.9 square miles.

15. San Francisco was founded June 29, 1776.

16. San Francisco was initially called Yearba Buena and was changed in 1848.

17. It is one of the richest cities in the world.

18. Chop Suey was created in San Francisco in 1878 during a banquet.

19. It has hundreds of coffee shops including the first coffee shop.

20. It is said the Godfather trilogy was scripted in San Francisco.

21. Nearly overnight, the gold rush transformed a fishing village into this city.

22. The computer mouse was invented in Silicon Valley.

23. It is full of crooked streets, with Vermont Avenue being the most crooked.

24. San Francisco outlawed burials in 1901.

25. Windows XP's default wallpaper of rolling hills and blue sky was shot in Napa Valley.

Share your facts, tips and more on Twitter using the #df12 and #marketingcloud hashtags. We'll be there engaging all week!

Want to win a new 2013 Ford Fusion Hybrid? We are so excited about the new Salesforce Marketing Cloud, we are giving one away. Join us at the Marketing Cloud Product Keynote on Thursday at 1:30 PM and you can pick up an entry form. Then drop it off with your contact details at the Marketing Cloud DF12 Campground booth by 3:30pm. For terms and conditions, click here.