I, admittedly, haven't read enough of the posts to know the specific cases, but I presume uptalk and quotative like rank highly.
The trends themselves are secondary, I was mostly just commenting on the supposed one to one mapping between adults being the main texters and adolescents being the supposed main originators of the trends. As thomblake notes, this may merely be an artifact introduced in the noise of reproduction and reporting.
Linguist Arnold Zwicky has named three linguistic 'illusions' which seem relevant to cognitive bias. They are:
Zwicky talks about them here, and in not so many words links them to the standard bias of selective perception.
As an example, here is an exerpt via Jerz's Literacy Weblog (originally via David Crystal), regarding text messages:
It is my conjecture that these illusions are notable in areas other than linguistics. For example, history is rife with allusions that the younger generation is corrupt, and such speakers are not merely referring to their use of language. Could this be the adolescent illusion in action?
So, are these notable biases to watch out for, or are they merely obvious instances of standard biases?