Hacker News
new
|
past
|
comments
|
ask
|
show
|
jobs
|
submit
login
Achievements, Game Mechanics and Social Software
(
25hoursaday.com
)
3 points
by
alexandros
on Feb 28, 2010
|
hide
|
past
|
favorite
Guidelines
|
FAQ
|
Lists
|
API
|
Security
|
Legal
|
Apply to YC
|
Contact
Search:
