<s>
Tuber	B-Application
(	O
)	O
was	O
a	O
web	B-Application
browser	I-Application
mobile	B-Application
app	I-Application
developed	O
by	O
Shanghai	O
Fengxuan	O
Information	O
Technology	O
that	O
allowed	O
users	O
within	O
mainland	O
China	O
to	O
view	O
filtered	O
versions	O
of	O
certain	O
websites	O
normally	O
blocked	O
by	O
the	B-Application
Great	I-Application
Firewall	I-Application
.	O
</s>
<s>
Filtered	O
versions	O
of	O
websites	O
such	O
as	O
Google	B-Application
,	O
Facebook	B-Application
,	O
Instagram	B-Application
,	O
YouTube	B-General_Concept
,	O
Twitter	B-Application
,	O
Netflix	O
,	O
IMDb	O
,	O
and	O
Wikipedia	O
could	O
be	O
viewed	O
.	O
</s>
