I'm intrigued as to where these have all suddenly (it seems) appeared from. They're absolutely rife on this site and Facebook, etc.
I'm thinking of "words" such as: alot, abit, inbetween, incase, infront, eachother and quite a few others. Is it just the same process as "maybe", "tomorrow", "today", etc.?
Another thing is the common confusion between "non" and "none" (i.e. "it's non [sic] of my business"), but I suspect that's a pronunciation issue a bit like "have" being confused with "of".