<s>
yfrog	B-Algorithm
is	O
a	O
defunct	O
image	B-Algorithm
hosting	I-Algorithm
service	I-Algorithm
formerly	O
run	O
by	O
ImageShack	O
.	O
</s>
<s>
It	O
was	O
designed	O
primarily	O
to	O
allow	O
users	O
to	O
share	O
their	O
photographs	O
and	O
videos	O
as	O
links	O
on	O
the	O
Twitter	B-Application
microblogging	B-Application
platform	O
.	O
</s>
<s>
Yfrog	B-Algorithm
was	O
launched	O
in	O
February	O
2009	O
.	O
</s>
<s>
The	O
name	O
yfrog	B-Algorithm
was	O
based	O
on	O
"	O
yellow	O
frog	O
"	O
,	O
which	O
is	O
the	O
logo	B-Device
of	O
ImageShack	O
.	O
</s>
<s>
The	O
original	O
yfrog	B-Algorithm
logo	B-Device
featured	O
a	O
yellow	O
frog	O
,	O
but	O
in	O
May	O
2011	O
was	O
changed	O
to	O
a	O
circle	O
of	O
six	O
speech	O
balloons	O
in	O
different	O
colors	O
.	O
</s>
<s>
Images	O
and	O
videos	O
were	O
uploaded	O
to	O
yfrog	B-Algorithm
via	O
the	O
website	O
interface	O
,	O
or	O
by	O
email	O
.	O
</s>
<s>
The	O
URLs	O
of	O
yfrog	B-Algorithm
links	O
were	O
shorter	O
than	O
on	O
ImageShack	O
(	O
e.g.	O
</s>
<s>
http://yfrog.com/1upend	O
)	O
,	O
in	O
order	O
to	O
fit	O
within	O
the	O
140	B-Application
characters	I-Application
limit	O
of	O
a	O
tweet	O
.	O
</s>
<s>
The	O
yfrog	B-Algorithm
website	O
was	O
optimized	O
for	O
mobile	O
viewing	O
,	O
and	O
aimed	O
to	O
capture	O
a	O
market	O
similar	O
to	O
TwitPic	O
's	O
.	O
</s>
<s>
As	O
of	O
October	O
2010	O
,	O
25	O
applications	O
supported	O
the	O
yfrog	B-Algorithm
upload	O
API	B-General_Concept
,	O
including	O
the	O
official	O
Twitter	B-Application
for	O
iPhone	O
app	O
,	O
TweetDeck	B-Operating_System
,	O
Seesmic	O
,	O
Twitterrific	B-Operating_System
,	O
and	O
Twittelator	O
.	O
</s>
<s>
Yfrog	B-Algorithm
had	O
approximately	O
29%	O
of	O
the	O
Twitter	B-Application
photo	O
sharing	O
market	O
in	O
2011	O
.	O
</s>
<s>
In	O
summer	O
2011	O
,	O
Twitter	B-Application
began	O
hosting	O
its	O
own	O
images	O
natively	O
through	O
its	O
web	O
and	O
mobile	O
interfaces	O
,	O
which	O
caused	O
usage	O
to	O
go	O
down	O
.	O
</s>
<s>
Yfrog	B-Algorithm
pivoted	O
to	O
run	O
its	O
own	O
social	O
media	O
service	O
,	O
Yfrog	B-Algorithm
Social	O
,	O
in	O
2012	O
.	O
</s>
<s>
Yfrog	B-Algorithm
Social	O
shut	O
down	O
in	O
2015	O
,	O
while	O
Yfrog	B-Algorithm
for	O
Twitter	B-Application
also	O
redirected	O
to	O
ImageShack	O
and	O
replaced	O
former	O
images	O
with	O
unrelated	O
ads	O
.	O
</s>
