Should I use “multiple” and “at once” in one sentence?

Question

I need to describe an app that lets users post to many social services at once. Is it correct to say "update multiple services at once"?

I'm open to alternative suggestions.

Answer 1

It seems that there's nothing wrong in this phrase, as long as "multiple" refers to the noun "services".

Answer 2

At once has at least two different, but related meanings

1 at the same time : simultaneously

2 immediately

While your usage may be comfortable with both, there could be circumstances where the immediately may be understood, but where you wanted to focus on at the same time.