<s>
A	O
social	B-Protocol
cataloging	I-Protocol
application	I-Protocol
is	O
a	O
web	B-Application
application	I-Application
designed	O
to	O
help	O
users	O
to	O
catalog	B-Library
things	O
such	O
as	O
books	O
,	O
films	O
,	O
music	O
albums	O
,	O
etc	O
.	O
</s>
<s>
The	O
phrase	O
refers	O
to	O
two	O
characteristics	O
that	O
generally	O
arise	O
from	O
a	O
multi-user	O
cataloging	B-Library
environment	O
:	O
</s>
<s>
The	O
ability	O
to	O
share	B-Application
catalogs	I-Application
and	O
interact	O
with	O
others	O
based	O
upon	O
shared	O
items	O
;	O
</s>
<s>
The	O
enrichment	O
or	O
improvement	O
of	O
cataloging	B-Library
description	O
through	O
either	O
explicit	O
cooperation	O
in	O
the	O
production	O
of	O
cataloging	B-Library
metadata	O
or	O
through	O
the	O
analysis	O
of	O
implicit	O
data	O
(	O
e.g.	O
</s>
<s>
"	O
people	B-Application
who	I-Application
like	I-Application
X	I-Application
also	I-Application
like	I-Application
Y	I-Application
"	O
)	O
.	O
</s>
