<s>
Tweetie	B-Application
is	O
a	O
client	O
for	O
the	O
social	O
networking	O
website	O
Twitter	B-Application
.	O
</s>
<s>
There	O
is	O
a	O
mobile	O
version	O
that	O
runs	O
on	O
iPhone	B-Device
,	O
iPod	B-Device
Touch	I-Device
,	O
and	O
iPad	B-Device
,	O
and	O
a	O
desktop	O
version	O
runs	O
on	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
Leopard	O
,	O
Snow	O
Leopard	O
and	O
Lion	O
(	O
respectively	O
10.5	O
,	O
10.6	O
and	O
10.7	O
)	O
.	O
</s>
<s>
Both	O
the	O
iOS	B-Application
and	O
Mac	O
versions	O
of	O
Tweetie	B-Application
were	O
acquired	O
by	O
Twitter	B-Application
on	O
April	O
9	O
,	O
2010	O
and	O
were	O
re-released	O
as	O
the	O
official	O
Twitter	B-Application
clients	O
for	O
iOS	B-Application
and	O
Mac	O
.	O
</s>
<s>
Tweetie	B-Application
2.0	O
for	O
iPhone	B-Device
was	O
the	O
first	O
app	O
to	O
introduce	O
the	O
Pull-to-refresh	O
user	O
interface	O
mechanism	O
.	O
</s>
<s>
The	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
version	O
of	O
Twitter	B-Application
had	O
many	O
of	O
the	O
same	O
features	O
as	O
its	O
mobile	O
sibling	O
.	O
</s>
<s>
In	O
addition	O
to	O
a	O
free	O
advertising	O
supported	O
version	O
,	O
the	O
paid	O
iOS	B-Application
and	O
OS	B-Operating_System
X	I-Operating_System
versions	O
cost	O
$2.99	O
and	O
$19.95	O
respectively	O
.	O
</s>
<s>
On	O
April	O
9	O
,	O
2010	O
,	O
Twitter	B-Application
announced	O
that	O
the	O
company	O
had	O
acquired	O
Tweetie	B-Application
.	O
</s>
<s>
Twitter	B-Application
stated	O
that	O
the	O
acquisition	O
stemmed	O
from	O
the	O
lack	O
of	O
an	O
official	O
,	O
Twitter-branded	O
mobile	B-Application
application	I-Application
.	O
</s>
<s>
Tweetie	B-Application
was	O
rebranded	O
as	O
"	O
Twitter	B-Application
for	O
iPhone	B-Device
"	O
and	O
released	O
on	O
May	O
17	O
,	O
2010	O
.	O
</s>
<s>
The	O
company	O
's	O
founder	O
,	O
Loren	O
Brichter	O
,	O
became	O
part	O
of	O
Twitter	B-Application
's	O
mobile	O
division	O
and	O
helped	O
launch	O
the	O
"	O
Twitter	B-Application
for	O
iPad	B-Device
"	O
application	O
.	O
</s>
<s>
On	O
January	O
6	O
,	O
2011	O
,	O
Twitter	B-Application
announced	O
that	O
the	O
company	O
had	O
also	O
acquired	O
the	O
desktop	O
version	O
of	O
Tweetie	B-Application
,	O
changing	O
the	O
name	O
to	O
"	O
Twitter	B-Application
for	O
Mac	O
"	O
.	O
</s>
<s>
"	O
Twitter	B-Application
for	O
Mac	O
"	O
was	O
launched	O
on	O
the	O
new	O
Mac	B-Application
App	I-Application
Store	I-Application
the	O
same	O
day	O
.	O
</s>
<s>
On	O
Tuesday	O
,	O
May	O
21	O
,	O
2013	O
Twitter	B-Application
announced	O
that	O
certain	O
patents	O
related	O
to	O
Tweetie	B-Application
would	O
never	O
be	O
used	O
except	O
to	O
defend	O
Twitter	B-Application
.	O
</s>
<s>
Ultimately	O
"	O
Twitter	B-Application
for	O
Mac	O
"	O
was	O
discontinued	O
after	O
a	O
very	O
slow	O
maintenance	O
schedule	O
in	O
March	O
2018	O
,	O
being	O
eventually	O
replaced	O
by	O
the	O
iOS	B-Application
version	O
compiled	O
using	O
Catalyst	O
in	O
October	O
2019	O
.	O
</s>
