<s>
GreenSpace	B-Operating_System
is	O
a	O
social	O
network	O
game	O
created	O
to	O
promote	O
environmentalism	O
.	O
</s>
<s>
SpaceJanitors	O
of	O
the	O
trash-clearing	O
GreenSpace	B-Operating_System
Corps	O
are	O
sent	O
into	O
outer	O
space	O
clean	O
up	O
the	O
planets	O
and	O
make	O
them	O
habitable	O
again	O
.	O
</s>
<s>
Players	O
select	O
pieces	O
of	O
trash	O
for	O
their	O
GreenSpace	B-Operating_System
Corps	O
avatar	O
to	O
clear	O
.	O
</s>
<s>
Players	O
can	O
purchase	O
RockeFuel	O
and	O
in-game	O
credits	O
using	O
real-world	O
money	O
to	O
help	O
them	O
advance	O
more	O
quickly	O
through	O
missions	O
and	O
upgrade	O
their	O
world	O
and	O
Greenspace	B-Operating_System
Corps	O
avatar	O
.	O
</s>
<s>
GreenSpace	B-Operating_System
participated	O
in	O
the	O
now-defunct	O
Facebook	O
Credits	O
program	O
.	O
</s>
<s>
GreenSpace	B-Operating_System
cost	O
of	O
US$	O
800,000	O
to	O
develop	O
over	O
the	O
course	O
of	O
2010	O
and	O
2011	O
.	O
</s>
<s>
On	O
August	O
2	O
,	O
2012	O
,	O
GreenSpace	B-Operating_System
received	O
a	O
major	O
update	O
.	O
</s>
<s>
In	O
September	O
2012	O
,	O
GreenSpace	B-Operating_System
was	O
released	O
for	O
iPad	B-Device
.	O
</s>
<s>
As	O
players	O
reach	O
in-game	O
milestones	O
in	O
GreenSpace	B-Operating_System
,	O
trees	O
will	O
be	O
planted	O
by	O
WeForest	O
to	O
reflect	O
their	O
progress	O
.	O
</s>
<s>
In	O
November	O
2012	O
,	O
as	O
part	O
of	O
its	O
partnership	O
with	O
weforest.org,	O
RocketOwl	O
announced	O
that	O
it	O
would	O
plant	O
a	O
tree	O
for	O
every	O
new	O
GreenSpace	B-Operating_System
player	O
until	O
the	O
end	O
of	O
2012	O
.	O
</s>
<s>
In	O
November	O
2012	O
,	O
GreenSpace	B-Operating_System
hit	O
a	O
high	O
of	O
80,000	O
monthly	O
active	O
users	O
.	O
</s>
