instant message, IM

Spell out instant message or instant messaging on the first mention if your audience might not be familiar with the abbreviation. After that, it's OK to use IM as a noun or modifier.

Don't use instant message or IM as a verb. Use send an instant message or send an IM instead.

Exception
In mobile UI content or to form a parallel construction with another one-word phrase, it's OK to use IM as a verb. For example, tap a name to call or IM someone.

Examples
To send an instant message, select Send IM on the toolbar.
Customize instant messaging features based on your friends, family, and work contacts.

Global tip The abbreviated form isn't available in all languages, so allow enough space for the full translated term in localized content.

See also message