<s>
Pet	B-Application
Society	I-Application
was	O
a	O
social-network	O
game	O
developed	O
by	O
Playfish	O
that	O
could	O
be	O
played	O
on	O
Facebook	B-Application
.	I-Application
</s>
<s>
The	O
game	O
ranked	O
as	O
one	O
of	O
the	O
most	O
popular	O
Facebook	B-Application
applications	O
.	O
</s>
<s>
An	O
iOS	B-Application
version	O
,	O
Pet	B-Application
Society	I-Application
Vacation	O
was	O
released	O
in	O
2011	O
with	O
similar	O
gameplay	O
,	O
but	O
set	O
on	O
a	O
tropical	O
island	O
with	O
new	O
settings	O
like	O
an	O
underwater	O
reef	O
.	O
</s>
<s>
In	O
August	O
2010	O
,	O
the	O
level	O
cap	O
of	O
Pet	B-Application
Society	I-Application
was	O
raised	O
to	O
100	O
.	O
</s>
