Three-time European champions United, who failed to qualify for the Champions League last season, are third on 72 points with one game remaining.
Callum Wilson scored in the 2-0 win for the home side.
The fan messaged the midfielder for 300 consecutive days.
Finnish entrepreneur Thomas Zilliacus also placed a bid on Thursday.
Liverpool's previous biggest win over United was a 7-1 victory in 1895.
Casemiro scored in United's 2-0 win at the Wembley on Sunday.
Manchester United came from behind to beat Barcelona 2-1 in Thursday's playoff second leg and progress 4-3 on aggregate.
Manchester United won 3-0 at Old Trafford on Sunday.
The clubs have until Monday to respond to the charges.
United fans have been clamouring for a change of ownership and the Glazers have been the target of intense criticism as the team last won silverware back in 2017.