Tumblr makes money from ads. Here's the founder's approach on that:
Tumblr would continue to take what he called the “’Mad Men’ approach.” He said the company decided early on that Tumblr would target the kinds of advertisers that aim to win awards by selling stories, not banner ads. (more)
“We’ve proven our ads can work,” Mr. Karp said, noting that Tumblr regu...
In 2001, the year English Wikipedia started, 20k articles were created. In 2002, article count grew to 100k, though 30k of these were written by a bot.
Number of articles then grew at roughly 2x/year from 2003 to 2007:
Jan 2003: 100k articles... (more)