This was a quote designed by Chacho Pueblo who wanted to use different fonts.  This design works because it puts emphasis on the what the main quote is about.  The main focus of the quote here is “anyone,” which has unique serifs while the rest are non-serif fonts.  Your next focus is then “social media.”  Xing is also essential or else you wouldn’t know which form of social media he is talking about.  While “don’t trust” is bigger in scale than “xing” is, they have different importance where one is bigger and one is bolded.  The top and bottom lines are smaller than the quote itself because it tones down the words itself, giving the audience a loving feeling when he speaks of his grandmother.