Liverpool substitute Curtis Jones and Everton midfielder Abdoulaye Doucoure were also shown red cards after the game, and the final whistle sparked a scuffle between both sets of players.
The post was deleted about an hour later. The league did not immediately respond to a request for comment.
A round-up of Saturday's action in the Premier League.
Everton's Ashley Young came on as a second-half substitute but his 18-year-old son Tyler remained on the Peterborough bench.
Bernardo Silva and Jack Grealish scored three minutes apart as Manchester City came from behind to beat Premier League newcomers Luton Town.
A round-up of Saturday's action in the English Premier League.
Images from Saturday's action in the Premier League.
Granit Xhaka hammered two goals in what is expected to be his last game as Arsenal clinched a 5-o win over Wolves.
The Premier League's bottom two clubs met at Goodison Park and there was more woe for Everton as they bowed out on penalties to Southampton after a 1-1 draw.
Images from Saturday's third round matches in the FA Cup.
Watford and Crystal Palace continued to inch towards Premier League safety after a scrappy goalless draw at Vicarage Road on Saturday that means the home side have taken just two points from a possible 21.
Paris St Germain reduced Olympique Lyonnais' Ligue 1 lead to one point after Ezequiel Lavezzi's first-half strike earned the champions a 1-0 home win over Stade Rennes on Friday.
United, who had Nemanja Matic sent off for a second bookable offence in injury time, had an early effort from Alexis Sanchez disallowed for offside but soon took command via a scrappy 35th-minute effort from Romelu Lukaku and a superb left-foot volley from Chris Smalling three minutes later.
Liverpool's Diogo Jota bagged a last-gasp equaliser to salvage a breathless 2-2 Edraw against Fulham.
Liverpool dominated the Premier League last season, winning their first domestic league title for 30 years
Arsenal snapped a season-long jinx against Newcastle United with a nervy 1-0 win in their last Premier League home game on Sunday.
Mourinho takes a veiled jibe at Lukaku
Images from the English Premier League matches played on Tuesday
IMAGES from the Premier League matches played on Saturday
Watford enjoyed their first Premier League win of the season as goals from Gerard Deulofeu and substitute Andre Gray gave them a 2-0 win at Norwich City in a bottom-of-the-table game on Friday.
Sergio Aguero netted his 13th hat-trick for Manchester City as the champions made light of the absence of the injured Kevin De Bruyne to thrash Huddersfield Town 6-1 and move joint top of the Premier League.
Everton's Abdoulaye Doucoure scored an extra-time winner as they edged Rotherham United 2-1 in an absorbing FA Cup
Wolverhampton Wanderers stunned Tottenham Hotspur 2-1 with stoppage-time goals from Pablo Sarabia and Mario Lemina on Saturday, thwarting the visitors in their bid to reclaim top spot in the Premier League table.
Images from the English Premier League matches played on Saturday.
Romelu Lukaku struck twice as Manchester United returned to winning ways after two successive Premier League losses with a 2-0 victory over Burnley at Turf Moor on Sunday.
IMAGES from Saturday's action in the English Premier League.
IMAGES from the English Premier League matches played on Sunday.
Arsenal's best chance to equalise came from a Granit Xhaka free kick which looked destined for the top corner until the Gunner's former keeper Emiliano Martinez at full stretch pushed it around the post with a fingertip save.
Tottenham Hotspur's England duo Harry Kane and Dele Alli fired them to a comfortable 2-0 win over mid-table Watford that cemented their place in the top four at Wembley on Monday.
Bruno Fernandes struck from the penalty spot in the ninth minute of stoppage time to give Manchester United victory at Brighton & Hove Albion in the Premier League on Saturday after an incredible finale.
A summary of Sunday's action in the Premier League.
Kevin de Bruyne struck twice to inspire Manchester City to a dominant 4-2 win at Crystal Palace on Saturday and move the champions level on points with Liverpool at the top of the Premier League table.
IMAGES from the English Premier League matches played on Saturday.
IMAGES from the EPL matches played on Sunday
Here are six who could make the biggest impact in this season's English Premier League.
Photos from the football matches played on Sunday.
Manchester United spurned a chance to move into the Premier League's top four after striker Zlatan Ibrahimovic missed a penalty in a 1-1 draw against 10-man Bournemouth on Saturday.
Leicester City won at Arsenal for the first time in 47 years on Sunday, with substitute Jamie Vardy's late close-range header enough to secure victory in the Premier League at The Emirates.
Arsenal squandered a two-goal lead as Watford hit back to draw 2-2 in new manager Quique Sanchez Flores's first game of his second stint in charge at Vicarage Road on Sunday.
Manchester City stayed ahead of age-old local rivals Manchester United at the top of the Premier League on Saturday with a deserved 1-0 win away to champions Chelsea.
