Another wrote: "PAUL IS HEADLINING GLASTONBURY HOLY S***".
McCartney's initial post showed black-and-white photos of three people and the legend's Twitter followers quickly surmised who they were and what the clues meant: minimalist composer Philip Glass, actress Emma Stone and Chuck Berry.
In recent years, the spot has been filled by the likes of Kylie, Lionel Richie and Dolly Parton.
Pyongyang says denuke talks with USA ‘impossible’ unless U.S. drops hostile policy
North Korea said last week the US recently proposed via an unidentified third country its offer to meet again in December.
Luis Enrique returns as Spain coach in place of Robert Moreno
Rubiales also confirmed that Enrique would continue his duties all the way up to the next World Cup in Qatar in 2022. Today we can confirm that Luis Enrique is returning to the national team.
Bigg Boss 13: Got closer to Rashami on show, says Arhaan Khan
Rashami and Devoleena were heard referring to Salman Khan's warning to not trust Paras and Mahira and play the game intelligently. This is probably the first time that someone who has performed so well in a task has been eliminated from Bigg Boss.
Other rumoured stars include The 1975 and the Spice Girls, while organiser Emily Eavis was reported to have ruled out appearances by Fleetwood Mac and Led Zeppelin during a question and answer session at the Cheltenham Literature Festival in Gloucestershire, England last month. "I'm sorry", she said.
McCartney will top the bill on the Pyramid Stage at the annual festival on Saturday 27 June 2020, which will take place as usual at Worthy Farm in Pilton, Somerset.
Founder Michael Eavis has said one of his biggest regrets was turning down another ex-Beatle, guitarist George Harrison, when he had the chance to book him for Glastonbury a few years before he died in 2001.