<s>
A	O
social	B-General_Concept
bookmarking	I-General_Concept
website	I-General_Concept
is	O
a	O
centralized	O
online	O
service	O
that	O
allows	O
users	O
to	O
store	O
and	O
share	O
Internet	O
bookmarks	O
.	O
</s>
<s>
Such	O
a	O
website	O
typically	O
offers	O
a	O
blend	O
of	O
social	O
and	O
organizational	O
tools	O
,	O
such	O
as	O
annotation	O
,	O
categorization	O
,	O
folksonomy-based	O
tagging	B-General_Concept
,	O
social	B-Protocol
cataloging	I-Protocol
and	O
commenting	O
.	O
</s>
<s>
The	O
website	O
may	O
also	O
interface	O
with	O
other	O
kinds	O
of	O
services	O
,	O
such	O
as	O
citation	B-Application
management	I-Application
software	I-Application
and	O
social	O
networking	O
sites	O
.	O
</s>
<s>
Name	O
Description	O
BibSonomy	B-Application
A	O
system	O
for	O
sharing	O
bookmarks	O
and	O
lists	O
of	O
literature	O
.	O
</s>
<s>
Digg	B-Application
A	O
news	O
aggregator	O
with	O
an	O
editorially	O
driven	O
front	O
page	O
.	O
</s>
<s>
Hatena	O
Hatena	O
Bookmark	O
is	O
a	O
social	B-General_Concept
bookmarking	I-General_Concept
service	O
by	O
a	O
Japanese	O
company	O
.	O
</s>
<s>
Pinterest	B-Application
A	O
web	O
and	O
mobile	O
application	O
that	O
offers	O
visual	O
discovery	O
,	O
collection	O
,	O
sharing	O
,	O
and	O
storage	O
of	O
images	O
.	O
</s>
<s>
Pinboard	O
Pinboard	O
has	O
a	O
plain	O
design	O
and	O
a	O
focus	O
on	O
personal	O
management	O
of	O
bookmarks	O
using	O
tags	B-General_Concept
to	O
organize	O
them	O
,	O
similar	O
to	O
early	O
versions	O
of	O
the	O
Delicious	B-Application
social	B-General_Concept
bookmarking	I-General_Concept
service	O
Pocket	B-Operating_System
Established	O
in	O
2007	O
,	O
for	O
storing	O
,	O
sharing	O
,	O
and	O
discovering	O
web	O
bookmarks	O
.	O
</s>
<s>
Reddit	B-Application
Users	O
submit	O
content	O
in	O
the	O
form	O
of	O
either	O
a	O
link	O
or	O
a	O
text	O
(	O
"	O
self	O
"	O
)	O
post	O
.	O
</s>
<s>
SiteBar	B-Protocol
A	O
free	O
online	O
bookmarking	O
manager	O
.	O
</s>
<s>
We	B-Algorithm
Heart	I-Algorithm
It	I-Algorithm
An	O
image-based	O
social	O
network	O
for	O
inspiring	O
images	O
.	O
</s>
<s>
Plurk	B-Protocol
A	O
free	O
social	O
networking	O
and	O
micro-blogging	O
service	O
that	O
allows	O
users	O
to	O
send	O
updates	O
(	O
known	O
as	O
plurks	B-Protocol
)	O
through	O
short	O
messages	O
or	O
links	O
,	O
which	O
can	O
be	O
up	O
to	O
210	O
text	O
characters	O
in	O
length	O
(	O
previously	O
140	O
)	O
.Scoop.itA	O
content	O
curation	O
website	O
that	O
lets	O
businesses	O
and	O
professionals	O
to	O
research	O
and	O
publish	O
content.FlipboardA	O
content	O
aggregator	O
website	O
that	O
allows	O
users	O
to	O
share	O
,	O
group	O
,	O
and	O
collect	O
content	O
from	O
multiple	O
sources	O
.	O
</s>
<s>
Clipmarksa	O
Delicious-like	O
social	B-General_Concept
bookmarking	I-General_Concept
service	O
,	O
bought	O
by	O
Clipboard	O
in	O
2012	O
.	O
</s>
<s>
Delicious	B-Application
The	O
site	O
was	O
bought	O
by	O
Avos	O
Systems	O
on	O
April	O
27	O
,	O
2011	O
,	O
though	O
was	O
operated	O
by	O
Yahoo	O
!	O
</s>
<s>
On	O
June	O
1	O
,	O
2017	O
,	O
Delicious	B-Application
was	O
acquired	O
by	O
Pinboard	O
,	O
and	O
the	O
service	O
will	O
be	O
discontinued	O
.	O
</s>
<s>
Gnolia	O
formerly	O
Ma.gnolia	O
My	O
Web	O
as	O
of	O
November	O
2005	O
-	O
Internet	O
Expert	O
oneview	O
Simpy	B-Application
formerly	O
de.lirio.us	O
StumbleUpon	O
StumbleUpon	O
was	O
a	O
discovery	O
engine	O
that	O
finds	O
and	O
recommends	O
web	O
content	O
to	O
its	O
users	O
.	O
</s>
<s>
It	O
has	O
moved	O
to	O
Mix	O
TrackleTrackle	O
offered	O
a	O
variety	O
of	O
information	O
categories	O
that	O
users	O
could	O
keep	O
tabs	O
on	O
and	O
share	O
like-interests	O
with	O
groups	O
of	O
users	O
via	O
Twitter	B-Application
,	O
SMS	B-Device
,	O
and	O
Email	O
.	O
</s>
<s>
Discontinued	O
on	O
October	O
1	O
,	O
2017	O
,	O
redirected	O
to	O
NBCNEWS	O
web	O
page	O
Xmarks	B-Application
Syncs	O
bookmarks	O
(	O
folders	O
&	O
sub-folders	O
)	O
and	O
profiles	O
across	O
different	O
browsers	O
and	O
platforms	O
.	O
</s>
<s>
On	O
May	O
1	O
,	O
2018	O
,	O
Xmarks	B-Application
was	O
discontinued	O
after	O
being	O
acquired	O
by	O
LastPass	B-Operating_System
.	O
</s>
