Allegedly, on or about 31 January 2013, Patrick O'Callaghan sent:
Just out of interest, why do some people use the non-existent word "i",
Any of - they don't know better, they don't care in the first place, they don't care about correcting typing errors, they didn't notice, they're typing one-handed, they're so used to spelling correctors auto-correcting their typing for them...
The misuse of "loose" and "lose" bugs me the most, second is probably "dose" instead of "does." But seeing someone type in all-caps tends to be far more annoying that someone posting in all-lower-case.
Usually I gloss over the occasional one, but some messages require an awful lot of interpretation trying to figure out what they meant, thanks to their complete lack of structure.