Tech Trail: San Francisco & Silicon Valley

Danielle Morrill: Don't miss the 8-bit space invaders on the conference room

Paul Sawaya: Make friends with Mojo.

Mashable: See if you can grab a Google bike to get around the complex on. It will save you some energy and time. - Vadim Lavrusik Read more.

About Foursquare: On August 18, 2010, foursquare was introduced here as one of the launch partners for Facebook Places. Holger Luedorf spoke about foursquare's plans to integrate with— and compete with— Places. [LINK] Read more.

David Weekly: House your startup here! Apply at www.ventures.io

Mashable: Hey you, you're at Twitter HQ. Try the bamboo seats -- they're super comfy! - Ben Parr Read more.

macnews: Apple's Headquarters! It all starts here!

mark silva: This place knows good beer. Come prepared.

Seth Andrzejewski: Bring cereal!

Marshall Kurtz: Interested in joining our team? Check out our available positions at: dropbox.com/jobs

Kevin Rose: Try the Digg casserole, it's breathtaking.

harryh: Home of the best engineering team in San Francisco!

Matt Van Horn: Try the red bull from one of our two red bull fridges

Jack Dorsey: For a good time, assemble a Square. Don't get epoxy on your hands though.

Steve Jang: Try the SoundTracking app and use it to post music w/ your foursquare check-ins. It's good for you.

Mike Bloomberg: Today, I was here to meet with the entrepreneurs at Y Combinator.

Shirley Hornstein: Check out the awesome views from the rooftop deck!

Kate Scisel: Tweet your floor # to operate the elevator ;)

Amanda Wixted: try the mafia wars! they're delicious!

Richard Boardman: Enjoy the best view in silicon valley ... From sf to san Jose, mt tam to mt Hamilton, goog, NASA, yahoo, Dana street cafe - we have it all!

Amanda Van West: We use dropbox, so you know it's good! :)

Mike Butcher: I recommend the lunch menu. But only if invited.

Steve Cheney: Be sure to checkin on foursquare

Joshua Slayton: Try out the fully-stocked bar

Jenny S: Comfy pillows at the lobby

Christina Hug: Stop in to see our famous post-it wall, play some hopscotch, or duke it out at ping pong.

David Noël: Come in and give everyone a high five

Song Zheng: Song is the coolest person ever. Ask for song when u go here.

James Yu: Go to scribd and play some ping pong with the Scribd team. We're always up for a challenge.

Sharon Schmidt: Show up thirsty and hungry!

Zach Holman: Get the pulled pork sandwich.

S. Johnson: "Noise and cramped quarters basically force you to listen in on conversations"

S. Johnson: "South of Market (SoMa) is the home address and the epicenter of Web 2.0 startups"

S. Johnson: "South Park’s version of Coupa Café"

apas: Free wifi from I/o ventures