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You can set a workflow rule on the Account object itself to send an email alert. Of course the number of rules or complexity will depend on how many accounts/people you need to notify.
Otherwise a field update to accounts when an user checkbox is checked could update a custom field that can trigger a chatter notification to anyone following the account.
Alternatively you can trigger a workflow rule off the rollup summary field, which could update a field that would trigger a chatter alert.
And finally there is an app called "ChattoMate - Workflow Automation for Chatter" which has Chatter automation functionality, including Automate follows and Notifications to Chatter much like workflow but you can use formula fields and rollup fields.
https://appexchange.salesforce.com/listingDetail?listingId=a0N3000000B3aJLEAZ
There is a 30 day free trial
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