2

Do we say:

Can you please write up a testimonial about me on LinkedIn?

or

Can you please write up a testimonial of me in LinkedIn?

3

Can you write (up) a testimonial about me on LinkedIn? is perfectly acceptable.

As a native speaker, I would personally say:

Would you mind posting a testimonial about me on LinkedIn?

-2

It depends!

You write testimonial for someone.

Could you please write a testimonial for me on my LinkedIn profile?

Someone can also give a testimonial. The example from Collins:

If I told them the truth, they had no reason to believe me; Hebburn wasn't going to give me a glowing testimonial.

For this particular case, it can work without preposition as well:

Could you please write a testimonial on my LinkedIn profile? - Since you are defining 'your' LinkedIn profile, it's undrestood that the testimonial is for you and not anyone else.

You can also have testimonial about something:

Could you please write a testimonial about my work with your firm?

  • 2
    "write a testimonial FOR me" sounds to me like you don't know how to write and are asking someone more literate to write something FOR you. The OP's original ABOUT ME is more idiomatic in this situation. – CocoPop Jun 30 '15 at 14:08
  • that's interesting...and I agree @CocoPop – Maulik V Jul 1 '15 at 4:50
  • For doesn't sound like that to me, it sounds like how @MaulikV meant it. However, I agree that for is ambiguous between these two meanings and could possibly be misunderstood. About is the better choice for that reason. – Era Jan 15 '16 at 16:51

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