The Facebook CEO
published a note to commemorate Facebook’s 15th anniversary
and, in the words of Facebook’s official
Twitter account, reflect “on how the world has changed, the
challenges we’ve faced, the progress we’ve made, and where we’re
In the note, Zuckerberg once again recounts his
dorm room decision to create “a simple website organized around
people,” which eventually grew to more than 2 billion users.
The CEO also notes the “new social and ethical issues” Facebook
is now grappling with and that the company plans to invest billions
of dollars into security this year.