I have adapted the system of Braille contractions and short-form words to a shorthand for use on Twitter.
Single Letter Contractions
B but
C can
D do
E every
F from
G go
H have
J just
K knowledge
L like
M more
N not
P people
Q quite
R rather
S so
T that
U us
V very
W will
X it
Y you
Z as
Multi-Letter Contractions or Short-Form Words
ab about
abv above
ac according
acr across
af after
afn afternoon
afw afterward
ag again
agst against
alm almost
alr already
al also
alt altogether
alth although
alw always
bc because
bf before
bh behind
bl blind
blw below
bn beneath
brl Braille
bs beside
bt between
byd beyond
ch child
chn children
concv conceive
concv conceiving
cd could
dcv deceive
dcvg deceiving
dcl declare
dclg declaring
fst first
fr friend
ei either
gd good
grt great
herf herself
hm him
hmf himself
imm immediate
lr letter
ll little
mch much
mst must
myf myself
nec necessary
nei neither
o'c o'clock
onef oneself
ourvs ourselves
pd paid
percv perceive
percvg perceiving
perh perhaps
qk quick
rcv receive
rcvg receiving
rjc rejoice
rjcg rejoicing
sch such
sd said
sh shall
shd should
st still
td today
tgr together
th this
themvs themselves
tm tomorrow
tn tonight
wd would
xf itself
xs its
yr your
yrf yourself
yrvs yourselves