<s>
Friends	B-Application
for	I-Application
Sale	I-Application
was	O
a	O
massively	B-Application
multiplayer	I-Application
online	I-Application
business	B-Application
simulation	I-Application
game	I-Application
originally	O
developed	O
by	O
Serious	O
Business	O
,	O
available	O
as	O
an	O
application	O
on	O
the	O
social	O
networking	O
website	O
Facebook	B-Application
.	I-Application
</s>
<s>
Since	O
its	O
launching	O
by	O
November	O
2007	O
,	O
Friends	B-Application
for	I-Application
Sale	I-Application
soared	O
into	O
popularity	O
by	O
June	O
2008	O
,	O
becoming	O
one	O
of	O
the	O
top	O
ten	O
Facebook	B-Application
applications	O
with	O
around	O
700,000	O
daily	O
users	O
and	O
activity	O
peaked	O
at	O
around	O
6.5	O
million	O
monthly	O
users	O
on	O
2	O
November	O
2009	O
until	O
Zynga	O
acquired	O
Serious	O
Business	O
on	O
11	O
February	O
2010	O
.	O
</s>
<s>
A	O
list	O
of	O
the	O
player	O
's	O
Facebook	B-Application
friends	O
appears	O
,	O
along	O
with	O
their	O
selling	O
price	O
.	O
</s>
