<s>
This	O
is	O
a	O
list	O
of	O
Wikipedia	O
articles	O
about	O
virtual	B-Architecture
communities	I-Architecture
.	O
</s>
<s>
Usenet	B-Application
,	O
one	O
of	O
the	O
original	O
decentralized	O
,	O
distributed	O
discussion	O
group	O
architectures	O
.	O
</s>
<s>
IM	B-Application
:	O
ICQ	B-Protocol
,	O
Yahoo	B-Application
!	O
</s>
