<s>
Openbook	B-Application
was	O
a	O
Facebook-specific	O
search	B-Application
engine	I-Application
,	O
built	O
upon	O
Facebook	B-Application
's	O
publicly	O
available	O
API	B-General_Concept
,	O
which	O
enabled	O
one	O
to	O
search	O
for	O
specific	O
texts	O
on	O
the	O
walls	O
of	O
Facebook	B-Application
subscribers	O
en	O
masse	O
which	O
they	O
had	O
denoted	O
,	O
knowingly	O
or	O
unknowingly	O
,	O
as	O
being	O
available	O
to	O
"	O
Everyone	O
,	O
"	O
i.e.	O
</s>
<s>
Both	O
an	O
avowed	O
parody	O
of	O
Facebook	B-Application
and	O
an	O
Internet	O
privacy	O
advocacy	O
website	O
,	O
it	O
was	O
built	O
by	O
San	O
Francisco	O
website	O
developers	O
Will	O
Moffat	O
,	O
Peter	O
Burns	O
and	O
James	O
Home	O
within	O
a	O
few	O
hours	O
on	O
May	O
12	O
,	O
2010	O
,	O
and	O
received	O
nearly	O
six	O
million	O
page	O
views	O
in	O
its	O
first	O
two	O
weeks	O
on-line	O
from	O
over	O
a	O
million	O
people	O
in	O
over	O
two	O
hundred	O
countries	O
.	O
</s>
<s>
In	O
July	O
2012	O
,	O
Openbook	B-Application
was	O
shut	O
down	O
due	O
to	O
legal	O
reasons	O
,	O
and	O
has	O
reverted	O
to	O
a	O
foreign	O
exchange	O
website	O
.	O
</s>
<s>
Facebook	B-Application
itself	O
later	O
added	O
the	O
same	O
capacity	O
to	O
search	O
Facebook	B-Application
pages	O
for	O
a	O
word	O
or	O
phrase	O
for	O
logged-in	O
users	O
,	O
but	O
pulled	O
it	O
in	O
January	O
2013	O
and	O
later	O
replaced	O
it	O
in	O
December	O
2014	O
with	O
a	O
more	O
limited	O
functionality	O
that	O
only	O
allows	O
users	O
to	O
search	O
their	O
own	O
posts	O
,	O
posts	O
by	O
people	O
they	O
follow	O
,	O
or	O
posts	O
which	O
have	O
been	O
shared	O
with	O
them	O
.	O
</s>
