When TikTok went off the air (to use a very old-fashioned phrase), there was a scramble to find an alternative to its shortform video feed — and a similar scramble by various social networks to provide that alternative. (In fact, while I was writing this, Tumblr launched its new Tumblr TV feature.) The question is: how successful are they?
Most certainly operate like TikTok. You scroll up to see the next short video, and you can like videos, follow their creators, or leave a comment. There…