Based on
this post, I did some more speculation on Kohut’s writings on narcissism and the sense of self. It suggests an explanation as to what we see a lot of here on KF. This is pure speculation, but bear with me.
Begin with someone whose sense of self-worth is threatened heavily by shame. Perhaps they are dealing with having some desires of behaviors which their peers describe as deviant, such as repressed homosexuality. (e.g., your average Tumblrina or furry) This lack of acceptance tends to cause a deficiency in their sense of self. Unable to cope with the trauma of everyday social interaction, the subject develops social phobia and feelings of worthlessness and shame.
The subject instead seeks solace by going online. Here, it is easy to find groups that will affirm even the most deviant of behaviors. However, the self-esteem that the subject receives is not genuine. Online interaction is not a suitable replacement for actual people. Instead, the subject creates a narcissistic false self, designed to protect themselves from their own hurtful past. The online peer group/hugbox is only too happy to welcome them in, since this false self is designed to appeal to them.
Threats to this false self still very much exist, both online and in real life. For example, a mean tweet that disparages the subject’s identity. The subject responds to this injury to their ego with narcissistic rage. The threat must be destroyed in order to maintain the false self and keep the inner bad feelings, which are still there, from being realized.
This may explain why so many people who live their lives so heavily online tend to chimp out. Threats to their ego are met with rage, and revenge must be enacted in order to regain a sense of control over their environment. It would also explain why there exists a correlation between lolcow-dom and being trans: repressed homosexuality manifesting as autogynephilia.
EDIT: While I don't believe that most lolcows are truly NPD, they do exhibit narcisstic-like symptoms, specifically the creation of a false self to gain social approval and conceal a wounded ego. The good news is that this means that treatment has a better chance of success.
With regards to the OP, I think what is different nowadays as opposed to previous generations is that: 1) It is easier than ever to find a source of narcissistic supply in the form of an Internet hugbox, and 2) The narcissistic voices are the ones most likely to rise to prominence online, which I explained here.
Why is Twitter So Fucked Up?