8 Ways To Measure Twitter's Worth

Twitter finally began trading today, and it's now worth about $25 billion before options and restricted stock units. So, what is that really worth?

1. $80.5 million per page of Hatching Twitter, the biography of Twitter's early tumultuous years.

2. $490 million for every year of the life of Dick Costolo, the grown-up that turned Twitter into a real company.

3. $175 million for every character in a 140-character long Tweet.

4. About $244 for each user that checks Twitter every single day.

5. About $1,020 for each Tweet fired off during the Super Bowl this year.

6. About $49 for every Tweet sent each day.

7. $24.5 billion for each forgotten co-founder who wasn't at the New York Stock Exchange to ring the opening bell...

Noah who?

8. ...and $8.2 billion for each co-founder that was there.

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