A big part of what made Facebook reach IPO stage was the arrival of grandparents, aunts, uncles, teachers and yes, parents. Passing the “grandma test,” which pushed Facebook to over a billion users, is probably the key to Tumblr’s future. So, will Grandma use it? I tend to think not. At least not as many as those who joined Facebook, or at least not right away. Why? There are some inherent barriers. The idea of “blogging,” even when it is as simplified and dare I say enjoyable as Tumblr can make it, can still be highly intimidating to people who are less “computer savvy.” With Facebook, you sign up, add your friends, and then see what they are doing. It’s simple. With Tumblr, there is still the impression that you are actually starting a blog, which of course comes with perceived technical hurdles such as setting up a template/design for your “site.” Sometimes those perceived technical hurdles can be as deadly as real ones.