To complement OMG, here’s Bill Bailey on the plague of “LOL”:

(he actually did this with an audience at a live standdup gig, but it’s dusappeared).

An economical expression such as

“I’m like, hello?”

is brilliant. Our elders (or let’s face it, some of us) would have to fall back on a ponderous formulation like

“I must confess I found myself at a loss to respond to the sheer fatuousness of my companion’s comment, and could only register a mock expression of disdain”.

Cf. this cartoon found on the splendid https://twitter.com/PhilosophyMttrs: