On first blush this forum would seem to be visual, as we are reading electronic text.
But as we settle in we start to notice things.
We notice we hang on replies.
And we notice that we can't see replies coming. Replies seem to just happen. And each reply can be felt all over the world at once.
So as our blushes subside and we enter social foreplay we notice that each reply is like a touch. A reply is like a touch on our bare skin.
And of course this is why we are all so sensitive - we are touching one another with each post and reply.
So at first blush it seemed as though this forum was visual, but as we enter social intercourse, it become apparent that this forum, this electronic medium, is tactile.
And because our very medium is tactile, and we are sensitive to each touch, we speak to one another with tact.
Both tactile and tact come from the Latin tactus meaning touch or sense of touch.