<s>
Twimight	B-Application
was	O
an	O
open	O
source	O
Android	B-Application
client	I-Application
for	O
the	O
social	O
networking	O
site	O
Twitter	B-Application
.	O
</s>
<s>
The	O
client	O
let	O
users	O
view	O
in	O
real	O
time	O
"	O
tweets	O
"	O
or	O
micro-blog	B-Application
posts	O
on	O
the	O
Twitter	B-Application
website	O
as	O
well	O
as	O
publish	O
their	O
own	O
.	O
</s>
<s>
In	O
addition	O
to	O
being	O
a	O
fully	O
functional	O
,	O
ad-free	O
and	O
open-source	O
Twitter	B-Application
client	O
,	O
Twimight	B-Application
allowed	O
communication	O
if	O
the	O
cellular	O
network	O
is	O
unavailable	O
(	O
for	O
example	O
,	O
in	O
case	O
of	O
a	O
natural	O
disaster	O
)	O
.	O
</s>
<s>
Twimight	B-Application
was	O
also	O
equipped	O
with	O
a	O
feature	O
called	O
the	O
"	O
disaster	O
mode	O
"	O
,	O
which	O
users	O
could	O
enable	O
or	O
disable	O
at	O
will	O
.	O
</s>
<s>
When	O
the	O
disaster	O
mode	O
was	O
enabled	O
and	O
the	O
cellular	O
network	O
was	O
down	O
,	O
Twimight	B-Application
used	O
peer-to-peer	O
communication	O
to	O
let	O
users	O
tweet	O
in	O
any	O
circumstance	O
.	O
</s>
<s>
Enabling	O
the	O
disaster	O
mode	O
enabled	O
on	O
the	O
phone	O
's	O
Bluetooth	B-Protocol
transceiver	O
and	O
connected	O
the	O
user	O
to	O
other	O
nearby	O
phones	O
.	O
</s>
<s>
This	O
created	O
a	O
mobile	B-General_Concept
ad	I-General_Concept
hoc	I-General_Concept
network	I-General_Concept
or	O
MANET	B-General_Concept
,	O
which	O
could	O
be	O
used	O
,	O
for	O
example	O
,	O
to	O
locate	O
missing	O
persons	O
even	O
when	O
the	O
communication	O
infrastructure	O
had	O
failed	O
.	O
</s>
<s>
Twimight	B-Application
started	O
out	O
as	O
a	O
project	O
for	O
a	O
Master	O
thesis	O
at	O
ETH	O
Zurich	O
in	O
the	O
spring	O
of	O
2011	O
.	O
</s>
