You can change the favicon, window name, and preview text when pasting into Facebook and such. To access this feature, click on the Gear icon in the upper right corner and go to the Domain Names tab.
What it looks like live on contracts, invoices, portals,etc:
When the link is pasted in social sites:
This is a great branding feature as your logo will be at the window of any form, invoice, contract, client portal, etc... Dubsado's name will not be up at the top anymore.