To create a customized Chatter app for your company, first upload your company logo to the Documents tab. Then create a new Chatter app and name it, selecting the uploaded logo. Choose suggested tabs like Chatter, Profile, Groups, and People, setting Chatter as the default. Finally, select the new branded Chatter app option.
2. Upload your Chatter Logo
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Go to the Documents Tab in Salesforce
Create a new Folder for IMAGES
Upload your Company (or Chatter-specific) Logo
3. Create a new Chatter App
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Go to Settings
Go to App Setup
Expand Create
Click on Apps