"People sometimes think things like twitter just take off overnight. Nope. It took them a few years to get real traction. Keep at it if you are still in year 1 or 2 of your business. Give your business at least 3 years."
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Getting More Awesome - Rishi’s Personal Blog: Reminder: Twitter was started in 2006 (via hiten)

Dovetails with this recent article from Joel Spolsky in Inc Magazine.  He brings up that it took them 3 years to figure out the right way to focus on their anchor product.

(via n8)