It decodes to "tswift", making ####tswift the answer channel
Level 1
Clue: ZnVueHIgdmcgYnNz
This is yet again a base64-encoded string, yielding "shake it off"
The answer: ####shakeitoff
Level 2
Clue: o3yhLKttMzAhpUV=
This puzzle introduced a twist to the base64-encoding. The answer string was encoded with rot13, then with base64, and then rot13 again
The answer: ####blankspace
Level 3
Clue: 576657787553509376
With the established theme of Taylor Swift, and references to the @SwiftOnSecurity account on twitter, people were expected to use the clue given in the topic as a tweet ID
At this point, people were expected to try out different ciphers. The Autokey cipher is an extension to the classic Vigenère cipher
The clue in the topic is encrypted with it (keyword georgecarlin, the channel name), yielding: thereisnothingnobleinbeingsuperiortoyourfellowmantruenobilityisbeingsuperiortoyourformerself
This is a quote from Ernest Hemingway:"There is nothing noble in being superior to your fellow man true nobility is being superior to your former self"