Please keep in mind that such sources will have a very strong selection bias towards a group with lower than normal literacy skills, compounded by the effect of using handheld keyboardless communication devices (Smartphones and Tablets) which will strongly motivate the 'writing style' to one of brevity in the extreme.
I've no doubt that as speech to text features on these 'gadgets' improves, so will the apparent literacy skills likewise improve[1] amongst this group of users.
It might seem amazing to the older non-computer literate generation how the younger generation take to this technology like ducklings to water.
It would seem that only the more mature computer literate section of 'The Older Generation' are truly cognisant of the fact that the 'waters' our 'young ducklings' are taking to are, in reality, not so much a Duck Pond but more a stretch of Alligator infested water that only those possessed of youthful ignorance or of feeble mindedness would feel comfortable in the partaking of its dubious pleasures.
[1] No doubt along with the obligatory, yet sometimes interesting and inventive 'typos' thrown in for our amusement.