The reason why this new word usage takes favor is because of computer search.
The most correct way to track discussion topics across multiple mediums would be to create a centralized database and then you request an identifier whenever you want to discuss a new topic. And you use that new ID in your tweets and posts. Because IDs are unique, it is easy to track the beginning and end of the discussion -- just Google for AA536410-7827-4F4A-8F84-F33EE892D9E4 and all those discussions will come right up.
Of course it would be easier to have a decentralized topic identification system. This is what hashtags are and single word tags are preferred. And dieselgate sounds nicer than dieselscandal.