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Arun ChaubeyArun Chaubey 

Create an approval process to support a case escalation procedure, with the ability to approve directly from Chatter

I have created approval process for case escalataion, but it is not showing in chatter feed
NagaNaga (Salesforce Developers) 
Hi Arun,

Yes, you can have approvals through chatter.

Because it relies on both Chatter and Approvals, getting your organization set up for Approvals in Chatter involves more than just turning on the feature. To be sure that everything works correctly and that your users will see their approval requests as Chatter posts, we recommend that you follow these steps when you're ready to turn Approvals in Chatter on for your organization:Create an approval process.
Make sure Chatter feed tracking is enabled for the object on which your approval process is based.
Create an approval post template for the object on which your approval process is based. If you want to make this the default template for all approval processes on this object, be sure to check the Default checkbox when configuring your post template.
Repeat steps 1 – 3 for all approval processes in your organization, as needed.

Please follow the below link for more information:

https://help.salesforce.com/apex/HTViewHelpDoc?id=approvals_for_chatter_getstart.htm

Best Regards
Naga Kiran