Nihilism is a nuanced concept that many great thinkers have grappled with but "web forum nihilism" isn't. Internet nihilism usually just reads like someone who is suffering from some sort of depressive or anxiety disorder and expressing their symptoms, like catastrophization, over the 'net.
What I submit is that we are living in a society with a record level of depression, anxiety and other mental illnesses (the US for example is prescribing record levels of antidepressants). This record level of mental illness is simply spilling over onto the Internet. Why so many people in our society are ill is left as an exercise for the reader.
I would attribute depression and surge of mental illness to the fact that there is actually much less to be optimistic for in our times than not so long abo, instead of ideals or ideologies. Let's be pragmatic about it.
What I submit is that we are living in a society with a record level of depression, anxiety and other mental illnesses (the US for example is prescribing record levels of antidepressants). This record level of mental illness is simply spilling over onto the Internet. Why so many people in our society are ill is left as an exercise for the reader.