"Given our evolving businesses and the businesses of Ms. Sandberg and Mr. Dorsey are in, it has become increasingly hard for them to avoid conflicts relating to Boad matters, and they are not standing for re-election", Disney said in a statement.
Leaders of two technology powerhouses are leaving the Walt Disney Co.'s board as their companies increasingly compete with the media giant for the attention of online viewers.
Neither has addressed their departure. In addition to a partnership with the National Football League, the company announced it was livestreaming WNBA games previous year.
Twitter and Facebook both declined to comment.
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Twitter struck a deal with the NFL past year to air a 30-minute live show during football season. Also, with the consolidation in the entertainment industry and as Silicon Valley and Hollywood move closer, Disney's board has at times found itself having to deal with conflicts of interest.
The news of Dorsey and Sandberg's exit is somewhat of an acknowledgment of Twitter and Facebook's roles as media companies - something Facebook, at least, has been reluctant to publicly embrace.
Other directors who would not stand for re-election are Orin Smith, the 75-year-old lead independent director, and Robert Matschullat, 70, because of term and age limits for board members.
The two vacancies will be filled by Safra Catz, Oracle Corp.'s co-chief executive, and Illumina Inc.
CEO Bob Igler will continue to serve as chairman of the board.