QuickLinks -- Click here to rapidly navigate through this document

EXHIBIT 10.10

        The Associated Group, Inc., a Delaware corporation ("AGI"), hereby
executes this Instrument in order to become a party to the Tax Sharing Agreement
dated as of March 9, 1999, as amended by the First Amendment to the Tax Sharing
Agreement dated as of May 28, 1999, the Second Amendment to the Tax Sharing
Agreement dated as of September 24, 1999, the Third Amendment to the Tax Sharing
Agreement dated as of October 20, 1999, the Fourth Amendment to the Tax Sharing
Agreement dated as of October 28, 1999, the Fifth Amendment to the Tax Sharing
Agreement dated as of December 6, 1999, the Sixth Amendment to the Tax Sharing
Agreement dated as of December 10, 1999, and the Seventh Amendment to the Tax
Sharing Agreement dated as of December 30, 1999 (as amended, the "Agreement")
between and among AT&T Corp., a New York corporation ("AT&T"), Liberty Media
Corporation, a Delaware corporation ("Liberty"), for itself and on behalf of
each member of the Liberty Group (as defined in the Agreement),
Tele-Communications, Inc., a Delaware corporation, Liberty Ventures Group LLC, a
Delaware limited liability company, Liberty Media Group LLC, a Delaware limited
liability company, TCI Starz, Inc., a Colorado corporation, TCI CT
Holdings, Inc., a Delaware corporation, each Covered Entity listed on the
signature pages thereof, and each entity which becomes a party to the Agreement
pursuant to Section 23 thereto. Upon the acceptance hereof by the other parties
to the Agreement by execution hereof where indicated below, AGI will thereupon
be a party to the Agreement as a member of the Liberty Group (as defined in the
Agreement).

  Dated: January 14, 2000   THE ASSOCIATED GROUP, INC.
 
 
 
 
 
By:
 
/s/ Charles Y. Tanabe

--------------------------------------------------------------------------------

          Name:   Charles Y. Tanabe           Title:   Senior Vice President
 
AGREED AND ACCEPTED:
 
 
 
 
 
AT&T CORP.
 
LIBERTY MEDIA CORPORATION, for itself and for
each member of the Liberty Group
 
By:
 
/s/ illegible

--------------------------------------------------------------------------------

 
By:
 
/s/ Charles Y. Tanabe

--------------------------------------------------------------------------------

  Name:       Name:   Charles Y. Tanabe   Title:       Title:   Senior Vice
President

--------------------------------------------------------------------------------

  LIBERTY SP, INC.   LIBERTY AGI, INC.
 
By:
 
/s/ Charles Y. Tanabe

--------------------------------------------------------------------------------

 
By:
 
/s/ Charles Y. Tanabe

--------------------------------------------------------------------------------

  Name:   Charles Y. Tanabe   Name:   Charles Y. Tanabe   Title:   Senior Vice
President   Title:   Senior Vice President
 
LMC INTERACTIVE, INC.
 
TELE-COMMUNICATIONS, INC.
 
By:
 
/s/ Charles Y. Tanabe

--------------------------------------------------------------------------------

 
By:
 
/s/ Stephen M. Brett

--------------------------------------------------------------------------------

  Name:   Charles Y. Tanabe   Name:   Stephen M. Brett   Title:   Senior Vice
President   Title:   Sr. Executive Vice President
 
LIBERTY VENTURES GROUP LLC
 
LIBERTY MEDIA GROUP LLC
 
By:
 
/s/ Stephen M. Brett

--------------------------------------------------------------------------------

 
By:
 
/s/ John C. Malone

--------------------------------------------------------------------------------

  Name:   Stephen M. Brett   Name:   John C. Malone   Title:   Vice President  
Title:   Chairman
 
TCI STARZ, INC.
 
TCI CT HOLDINGS, INC.
 
By:
 
/s/ Stephen M. Brett

--------------------------------------------------------------------------------

 
By:
 
/s/ Charles Y. Tanabe

--------------------------------------------------------------------------------

  Name:   Stephen M. Brett   Name:   Charles Y. Tanabe   Title:   Vice President
  Title:   Senior Vice President

--------------------------------------------------------------------------------

QuickLinks

EXHIBIT 10.10