Narcissist Personality Disorder
Immediate sign is that of someone who acts in a ‘superior’ fashion to others and this impression is manifested both publicly and privately. The slightest criticism of the narcissist is not tolerated by the individual, one of the protective mechanisms to sustain the persona.
Theirs is an idealized version of themselves or artifice. It’s a grandiose concept without normal checks and balances. This inflated idealised persona enables focus away from the insecurities lurking beneath. The difficult exterior is the manifestation of the effort needed to sustain the illusion.
The Narcissist cannot function without biased, interpersonal support from others. The narcissist supply supports the attention demanded at both public and private levels. Without the supply the persona is unable to mask the vulnerability beneath.
Does Narcissist tendency increase with social media use? There seems to be a complex relationship between the two. It appears that social media has substantial impact on users including younger users and that they can be adversely affected. But what is commonly defined as Narcissism on social media is not necessarily the same as is formally defined as Narcissism. Some of these social media accounts may display a genuine self like/respect that is not NPD. It appears that Narcissists prior to taking to social media will be more attracted to texting based media (known as textual) such as Twitter whereas those yet to exhibit Narcissistic traits will do so after using Facebook or other visually based media.
But so many conditions and variables exist and there is no conclusive evidence that social media actually creates Narcissists.
From psychologytoday.com and other sources.