For those wondering, “How can I use twitter in my marketing?”, here are six strategies to consider.

Announce New Products or Services. A small 14-seat ice cream shop in San Francisco has 300,000 followers - more than Ben & Jerry’s or Dairy Queen. They announce an exciting new flavor. Customers show up!
Answer Customer Questions. With Twitter, followers can send direct questions [...]

If you want to see the impact of digital in advertsing spending, I encourage you to checkout the Razorfish Outlook Report.