Context affecting dialect/formality/informality

Here are two reviews of 'R U Mine' by Arctic Monkeys. I've chosen these two links in particular because I think they are good examples of how the platform/context differ due to dialect/formality/informality.

https://www.youtube.com/watch?v=6tOiG6H34nI
This link is taken from a music video in which user one particular states how he feels about this song. This comment, among others that are not relevant in the slightest, caught my eye as he states a negative and positive opinion on the band/singer/song. This is a valid review as a review is a statment of opinion on a topic/product/piece. Although it doesn't go into great detail, it is still a review of the song. The reason the user doesn't go into great detail, would be because people don't often go into the comment section of a YouTube video, to find an in-depth, long winded piece of writing with correct musical terminology, which also references past performances, other songs in the same album, and the singers/players abilities. People comment, most of the time, to just express how they feel about the song, its purpose is not to sell the performance or song to a particular audience. It is not written to be taken into consideration and to be read by a mass audience. This suggests why the writing style is so informal and relaxed.

http://www.nme.com/reviews/arctic-monkeys/14752
This link however is taken from a legitimate website which its sole purpose, among other things that relate to media, is to review music. This review is very long winded. It also references other songs by Arctic Monkeys, this suggests that the writer assumes the reader/audience would be familiar with other songs by the band. This portrays that the website may be read by a lot of fans, or people who are very familiar with the music being reviewed.It also is very in depth as the writer is able to state all the influences in the music that have been obtained from other bands/musicians, for example the writer says how Destiny's Child influenced part of 'Knee Socks'. Although it is clear to see that these reviews are aimed at, possibly, youth, as the writer uses this statement to describe how the drummer plays; "Helders’ drums have never sounded so hip-hop as they beat out the rhythm to Alex’s pissed-up booty call." The dialect here seems to relate to slang used by youth nowadays, 'booty call' for example. And although it is almost on a formal platform as its read by many as a legitimate review, it still reads very relaxed, although as it is a different context, it is very different on a general basis, when looking at content and language, as despite the relaxed tone, it is full of terminology and deep analysis.