You can disable feed post in Chatter settings.
Required Editions
| User Permissions Needed | |
|---|---|
| To enable or disable features in Chatter Settings: | Customize Application |
- From Setup, enter Chatter Settings in the Quick Find box, then select Chatter Settings.
- Click Edit.
-
In the Post and Comment Modification section, deselect the checkbox on Allow users
to edit posts and comments.
- Click Save.
-
If you have assigned the “Can Approve Feed Post and Comment” permission, disable that on
the relevant permission sets.
“Can Approve Feed Post and Comment” lets assigned users edit and delete any post or comment in any Chatter feed those users have access to. This permission is available under Setup | Permission Sets | Select a permission set | System Permissions.
The feed post editing feature is disabled for your entire organization (or, for step 5, for all users assigned the edited permission set). Users can no longer edit posts and comments.