Quote (Black XistenZ @ Jun 25 2019 11:04pm)
"Market share is no longer a useful metric" - Thor, circa 2019. ^_^
For real: note that I always say: monopoly within one field of social media. Youtube is the (quasi-)monopolist on video-based social media, instagram is the (quasi-)monopolist for image-based social media, twitter owns short-message-based social media, and facebook dominates the board- and community-based version of social media. Note that those fields all belong to social media, but are no substitutes for one another. Youtube cannot substitute what facebook does and vice versa, etc. pp.
Facebook honestly competes in all of those fields except video hosting, and Youtube has several competitors that allows much more lax copywrite rules. it's pretty common to see messages like "Youtube took my video down, see this Vimeo link for the current upload".
To calculate things as a percentage of social media market how would you do it? Number of messages? Users? Accounts? If you break it too much like "short versus long messages" then it just seems like you're really stretching differences to force a monopoly.