I agree here is a video citing 10 companies which are in crisis and could disappear soon (including YouTube)
- America Online
- Compuserve
- Geocities
- Tripod
- Friendster
- Myspace
Each of these were social networking sites. They were very large, very profitable.
Either they wiped out earlier forms or they were wiped out by Facebook.
The STEEM community is 500,000. Facebook has 2.07 billion monthly active users. I expect STEEM will add Facebook to the upper list. Eventually something will supplant STEEM.