The post, which has since been taken off Pietersen's page on the social networking site, said "Done for rest of summer! Man of the World Cup T20 and dropped from the T20 side too..."
England is due to name its squads for the limited-overs series later on Tuesday.
Pietersen, who is looking for a new county side after severing his ties with Hampshire, struggled for Test runs against Pakistan in bowler-friendly conditions this summer.
The South African-born batsman was named the player of the tournament as England won the World Twenty20 in May.
