Possible Clues:

• Verizon FiOS, e.g., for short
• Seller of Web access, briefly
• Surfer's requirement?: Abbr
• Key big-office payee
• Connection letters
• Connector to the WWW
• Verizon Fios or CenturyLink, for short
• Spectrum or Xfinity, briefly
• Modern mailbox provider
• Verizon Fios or Comcast's Xfinity, for short