To decipher this clue and find the answer, you will need to find the Cipher AND a Date on the twitter page.
Once you figure out the cipher and the date, decipher the clue. Then you will need to view the various quotes to get the answer.
Twitter Page
MLK Memorial Quotes
The date in question has Italian influences.
The cipher is A=N and N=A. Logically, write the first 13 letters of the alphabet out, and then put the next 13 letters right below the first 13 letters. Hence A=N and N=A.