Richard Dawkins once tweeted his rule for accepting something new.

If it adds something new to the language, he accepts it. If we already have existing words that do a better job, he rejects it.

This begrudgingly forced him to accept the use of ‘like’ the way teenage girls use it because they don’t mean “this person said”, or “I said”. They mean some more like “this person said something to the effect of”.

Interesting. One would expect Dawkins, being an evolutionary biologist and father of the concept of meme, to just accept the change. But he probably wasn't speaking of what should or should not be. Rather about what he's doing himself.