Delegates to Boundless 2015 are encouraged to join together and use the power of social media to tell the world that The Salvation Army celebrates its 150th birthday on 2 July 2015.

As well as continuing to use the hashtags #Boundless2015 and #WeAre150, participants can use their Twitter, Facebook or Tumblr accounts – or all three – to share a simple message through a Thunderclap. Once they have signed up, a message – ‘On this day in 1865 William & Catherine Booth founded The Salvation Army. Meeting human needs for 150 years #WeAre150 http://sar.my/weare150’ – will be sent simultaneously from supporters’ own accounts at 1pm British Summer Time on Founders’ Day (2 July), reaching friends and followers.

The link will take people to the International Headquarters (IHQ) website where they can find out more about the history and current ministry of The Salvation Army.

‘The beauty of a Thunderclap is its simplicity – all you need is a social media account,’ says IHQ Web Manager David Giles. ‘If you don’t already have one it’s free and easy to sign up. The message we’re encouraging people to share should open up plenty of opportunities for online conversation. Because all these messages occur at exactly the same time it is sure to get The Salvation Army noticed.’

At the time of writing, more than 1,000 supporters have signed up to take part (double the original target of 500), with a potential reach of almost 800,000 people, but David urges: ‘Taking into account the number of online connections that Salvationists and friends each have, the message could well reach millions of people worldwide.’

Find out more about Founders’ Day Thunderclap – and sign up today – at sar.my/thunderclap.

Once they have signed up to the Thunderclap, social media users are also invited to demonstrate their participation in Boundless – The Whole World Redeeming by adding the event’s round, interlocking logo to Twitter and Facebook profile photos. This can be done at sar.my/twibbon.