Please do so in moderation.
For video posts, additional tags are usually needed to specify the kind of trigger present.
There is a Free-For-All Friday sticky thread every Friday in which anything goes, so submit images, memes, jokes etc.
Reposting an old submission not submitted in the past 6 months can be ok, as it is sometimes nice to re-view old content, but use your initiative - recently-submitted content will be removed if resubmitted.
It would be a shame if the whole idea of it were to be dismissed as just another Internet fetish, because we all know that's not what it is.
YouTube links when linking to a video instead of linking to a webpage it is embedded in.