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I was using some user name on some forum. Then I changed that name. I want to address this in my signature.

What should I write?

  • I was posting as X before.
  • I used to post as X before.
  • I have posted as X before.

Which one of those is the best for what I mean?

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Any of these is ok, except I would simply say "I used to post as X"; the "before" here is redundant. However, to do what you want, I would prefer not to use any of these and use formerly instead:

Bob Rodes
formerly Sasquatch

For completeness's sake, "I was posting as X before" means that over a period of time in the past, you had the ongoing habit of posting as X. "I used to post as X" means pretty much the same thing, and I would prefer this usage. "I have posted as X before" means that at least once in the past you posted as X.

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I'd like to suggest another alternative: "Bob Rodes (aka Sasquatch)". This is especially useful when we still occasionally use the old name. :) – Damkerng T. Jun 15 '14 at 20:07
@DamkerngT. Or alias or aliter both meaning otherwise. – StoneyB Jun 15 '14 at 20:17
@StoneyB I've never heard aliter – Catija Mar 10 '15 at 5:22
I would point out that aka (also known as) and alias don't have the connotation of no longer being known as, whereas formerly does. – BobRodes Mar 11 '15 at 20:14

There are several alternatives depending on what kind of impression you want to make with your new persona.

  • ex-X
  • previously X
  • R.I.P. X
  • X has left the building
  • was X
  • X no more

and so on. Personally I wouldn't choose any of your three options.

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Don't use 'R.I.P. X'. People will think you are a friend (or enemy, or other acquaintance) of X, and X died. – SF. Mar 10 '15 at 10:11

The first one would match your situation best.

  • I was posting as X before. - I, as X, created multiple posts in the past.
  • I used to post as X before. - This is permissible but unrecommended due to ambiguity. While what you mean is you [don't post as X] anymore, the more intuitive interpretation is you [don't post anymore], and while you were posting, you were posting as X.
  • I have posted as X before. - ...and there are lasting effects, for example you know how to post there (and it's not a trivial feat); also, it allows the option that you posted there just once. Well, maybe the effects are the posts that are there or your acquaintances, but I don't think that's important to what you want to convey.
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