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I'm attempting to get a title for a list of interactions made on posts by users.

"Interactions by/per post". Are by and per interchangeable? Is one more formal than the other?

I feel that by might be easily misunderstood as interactions made by the posts itself instead of interactions with the posts by users. Is that a correct assumption?

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Interactions via post or snail-mail? – mplungjan Sep 12 '13 at 9:15
up vote 2 down vote accepted

"Interactions per post": the average number of interactions that happen on a post.

"Interactions by post": A list of interactions sorted by post. (Ignoring the possibility that post could be mistaken for mail)

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