Accent Tag

Concerning the disadvantages that youtube can have when introduced to learners of the English language is that you can find videos with almost all the existing dialects and accents of English on youtube.
If somebody listens to the different dialects simultaneously, they can end up using words that are different in the two variants interchangably. Thus, they can have difficulties when trying to acquire a given dialect, one that is spoken in the country they want to stay in. For instance, take someone who has been listening to British speakers on youtube, and then moves to America. It will be of no use to them that they have learnt from a youtube video that what you cover your scars with is a "plaster"; they will bleed to death unless they know that what they need is a "band-aid" in American.
Similarly, learners of English may encounter problems when applying an accent that they acquired through watching videos. Some accents of English are seen as subordinate or is spoken by uneducated people. If somebody wathes videos of his favourite musician being interviewed for hours a day, it is inevitable that he acquires the accent of that speaker. Suppose this accent is Cockney. Will this learner have difficulty communicating in other social classes later on? Can second language learners switch from one accent to the other as some native speakers do?

After having the problems stated, here is something that I found on youtube. This series of videos is called the "Accent Tag". Basically, it is a youtube community organisation that urges youtubers to record themselves pronouncing some words that are typically different in pronunciation in the different dialects of English. They also have to answer some questions, the answers to which highlight lexical differences. So, for instance to the question "What is the bubbly carbonated drink called?" an Australian would answer "soft drink", whereas in England it is called "fizzy drink".
These videos are really fun to watch. I'll just put an Australian example here: