links for 2011-07-15

• Twitter Drives 4x as Much Traffic as You Think. Here’s Why … | TechCrunch
  (tags: twitter analytics statistics strategy business)
• Vacation rentals, private rooms, sublets by the night – Accommodations on Airbnb
  Airbnb lets people rent out extra space effortlessly. It's free to sign up and with a built in community, your listing will be seen by a worldwide audience.
  (tags: travel startup ötlet social userpowered)
• quora | TechCrunch
  (tags: q&a quora)