I've never understood it.
But I'm starting to get used to it.
If you didn't know already by noticing the added tab above, I am now on Tumblr as well.
I am using it primarily for miscellaneous postings like random naughty pics with dirty rantings. However, for now you can also see some of the videos posted within some of the blog posts that you've read here over on that site. So feel free to check it out at your leisure. Enjoy. ;-)
LeNair's Tumblr - http://lxtreme.tumblr.com