in the space of a day about dropping Carol Thatcher from The One Show.
On Thursday, the corporation said it had received a total of 2,245 complaints about the decision to axe Thatcher, but by Friday the tally had reached 3,348.
The number of messages backing the BBC had more than doubled from Thursday, rising from 60 to 133.
The former prime minister's daughter was dropped from the programme after she referred to a tennis player as a "golliwog" during a conversation in the green room, where the production team and guests were gathered after the show was over.
London mayor Boris Johnson, who has been a regular guest on BBC programmes such as Have I Got News For You, said she should simply have been taken aside and spoken to about her language.
"I don't think she should have been fired," he told LBC 97.3 radio's Nick Ferrari At Breakfast show.
"I think the way to deal with it if someone says something a bit offensive in a green room and you are the producer of the show and everybody else has taken umbrage and feels uncomfortable - which is what happened, as I understand it - then you take that person on one side and you say 'Listen, you've got to understand we've all got to work together and you've got to watch what you say and you've got to be sensitive'.
"But I don't think you fire someone, I really don't."