I want to be able to use Tumblr, but I have no use for it and if YouTube is going to purchase Tumblr, it will most likely end up being in connection with Google; I no longer support Google in terms of having a Google account, so I would end up not being able to use Tumblr anyways. If Yahoo! were to purchase Tumblr or has, it would be the same result, I would not use it, because I do not want, nor need a Yahoo! account; especially with the security problems that I have been hearing about.
I also have interest in Twitter, but just like Tumblr, I cannot use it, because I have no use for it. There is also Skype, which I have interest in, but cannot use either.