Referring specifically to a patent application which deals with digital device interfaces that may involve linkages to existing well-known applications: Should the use of those icons and/or product names (example: Facebook, Twitter, LinkedIn, etc.) be avoided? Or maybe no problem if credited appropriately? (example: "**Symbol/Icon ©Facebook Inc.") Or maybe there is no issue and no credit is needed, as long as the use of those images or names are clearly not part of the Claims or design?
What is the name of your state, crmcneill, or, if not in the US, what is the name of your country?
Trademarks can be used to describe a specific business or its goods/services. It is generally smart to avoid using (and usually there is no need to use) a company's logo.
If the rights-protected company, goods and/or service is not part of your claim/design, however, there is probably no need to include them in your patent application.
Whether you need to use any entity's trademark at all should be discussed with your patent attorney when you fill out your application.