<s>
PubSub.com	O
was	O
a	O
prospective	B-General_Concept
search	I-General_Concept
engine	O
for	O
searching	O
blogs	O
,	O
press	O
releases	O
,	O
Usenet	B-Application
,	O
USGS	O
earthquake	O
alerts	O
,	O
SEC	O
filings	O
and	O
FAA	O
Flight	O
Delay	O
information	O
.	O
</s>
<s>
The	O
site	O
,	O
founded	O
in	O
2002	O
by	O
Bob	O
Wyman	O
and	O
Salim	O
Ismail	O
,	O
operated	O
by	O
storing	O
a	O
user	O
's	O
search	O
term	O
,	O
making	O
it	O
a	O
subscription	O
,	O
and	O
checking	O
it	O
against	O
posts	O
on	O
blogs	O
which	O
ping	B-Protocol
the	O
search	O
engine	O
.	O
</s>
<s>
This	O
feature	O
led	O
PubSub	B-Application
to	O
call	O
itself	O
a	O
"	O
matching	O
engine	O
"	O
.	O
</s>
<s>
Results	O
could	O
be	O
read	O
on	O
the	O
service	O
's	O
website	O
or	O
on	O
an	O
optional	O
sidebar	O
,	O
available	O
for	O
both	O
Internet	B-Application
Explorer	I-Application
and	O
Mozilla	B-Application
Firefox	I-Application
,	O
written	O
by	O
Malcolm	O
Pollack	O
and	O
Duncan	O
A	O
.	O
Werner	O
respectively	O
,	O
or	O
via	O
RSS	O
.	O
</s>
<s>
PubSub	B-Application
ran	O
into	O
problems	O
in	O
2006	O
as	O
noted	O
in	O
a	O
blog	O
entry	O
by	O
Bob	O
Wyman	O
and	O
is	O
now	O
dead	O
.	O
</s>
<s>
The	O
PubSub	B-Application
website	O
was	O
offline	O
from	O
15	O
January	O
2007	O
until	O
15	O
August	O
2007	O
.	O
</s>
<s>
Something	O
Simpler	O
is	O
planning	O
to	O
launch	O
a	O
Facebook	B-Application
application	O
similar	O
to	O
the	O
original	O
PubSub	B-Application
sidebars	O
.	O
</s>
<s>
As	O
November	O
18	O
,	O
2009	O
,	O
PubSub	B-Application
v2.0	O
was	O
publicly	O
accessible	O
again	O
.	O
</s>
