<s>
A	O
click-to-donate	B-Application
site	I-Application
is	O
a	O
website	O
where	O
users	O
can	O
click	O
a	O
button	O
to	O
generate	O
a	O
donation	O
for	O
a	O
charity	O
without	O
spending	O
any	O
of	O
their	O
own	O
money	O
.	O
</s>
<s>
Yet	O
there	O
are	O
still	O
many	O
in	O
operation	O
,	O
notably	O
Freerice	B-Application
,	O
The	O
Hunger	O
Site	O
,	O
and	O
Por	O
Los	O
Chicos	O
.	O
</s>
<s>
Flattr	O
and	O
CentUp	O
(	O
now	O
defunct	O
)	O
used	O
click-to-donate	B-Application
technology	O
on	O
many	O
sites	O
instead	O
of	O
being	O
centralized	O
on	O
just	O
one	O
.	O
</s>
