I saw this post, and I just wanted to comment on the mathematics of it. There's a well-documented effect in graph/network theory called the "friendship paradox", which simply states that on average, our friends have more friends than we. It follows simply from an application of the Cauchy-Schwarz and arithmetic/geometric mean (AM-GM) inequalities. Because number of friends (degree centrality) is correlated highly with eigenvector centrality in most network topologies, and the same so with income, it will always appear that our friends have more.

The effect is old: former generations called it "keeping up with the Joneses", but as with so much else, social media has only accelerated the natural human tendency to jealousy and feelings of inadequacy.

See also