Led by Jeff Bezos of Amazon, Spark Capital and existing investors Union Square Ventures and Digital Garage, Twitter received an estimated $15M infusion today. The actual number is undisclosed but is instead based on a previous report from PaidContent’s Rafat Ali who claims a new total of $20M in VC (their first round yielded $5M) and a $100M valuation.

The first order of business is to invest in infrastructure as overwhelming popularity has led to constant blackouts.

The second order of business will be to figure out how to make money, but “..our biggest opportunities will be worth pursuing only when we achieve our vision of Twitter as a global communication utility. To reach our goal, Twitter must be reliable and robust.” says co-founder Biz Stone.

It should also be noted that Twitter rides on Rails, and some have suggested a switch to PHP might help with scaling issues.