OT - I always get delayed in commenting because of "spank me". XD I have to take a few seconds to giggle like a child every time.
Anyway! People change their usernames on tumblr all the time, so I can't imagine it would be a big problem. You can always just add an extra letter (like, "askeriian"). I mostly just use the "Ask box" feature for conversations. It's a bit inconvenient, but tumblr isn't really for conversations. XD; You'll get used to it very fast. Tumblr is all about efficiency and speed. I follow 300+ people and it still never seems like enough!
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Anyway! People change their usernames on tumblr all the time, so I can't imagine it would be a big problem. You can always just add an extra letter (like, "askeriian"). I mostly just use the "Ask box" feature for conversations. It's a bit inconvenient, but tumblr isn't really for conversations. XD; You'll get used to it very fast. Tumblr is all about efficiency and speed. I follow 300+ people and it still never seems like enough!