Some of them, yes. A great many are not. Taking your "last year" to be poetic rather than literal: -gate is cliche, "meme" is totally a thing now, "my bad" has diffused into informal communication all over Anglophonia, lolcat-speak still has everybody's great-aunt snorting at her Facebook wall, texting acronyms are well-known to everyone, word truncation + s is on its way to becoming totes ubiqs, etc.

Not to mention you're using a pretty useless definition of "outdated" if it includes literally everything.