Technically, you can turn any noun into a verb pretty much by adding the ending "-en" or just conjugating it and using it in the position of a verb.
Ich kühlschranke meine Küche.
Ich infinitesimalrechnunge vor mich hin.
You can also do that to any English noun.
Ich habe gestern ganz viel ge-iced-lattet.
It is not by any means correct German. But whether or not someone understands it depends on whether or not the person knows the words (and on context, as in the iced latte example). Sometimes journalists do stuff like that for stylistic reasons.
The pattern itself is pretty clear and everyone should get "verb". Based on that we have
- googeln , photoshoppen and possibly duckduckgoen (or shorts of that, although this site is pretty much unknown around here)
Similarly you can make up "tumblern", "facebooken", "whatsappen"... it doesn't matter.
Now, as for the dictionary. German is a bit more conservative than English so before such a word makes it into a dictionary like Duden it must have pretty much "made it" (be widespread, in spoken and written). I was surprised to see that "to photoshop" is in the Oxford dictionary.
But I don't see any reason to rush it. A word is a word because people use it and understand it - not because it's in the dictionary. And it's an English word anyway, so why would you need it in there to begin with?