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Every week, in addition to the top 10 you'll keep track of:
- Top climbers
- Top newcomers

Global ranking of Top 500 influencers and players active on Twitter in Building Services - those who are involved with services and facilities, RACHP, ventilation, heating, plumbing and pipework. Players listed on the leaderboard range from contractors, sub-contractors and specialist contractors, via government and campaigning organisations, to market-leading engineers; from those concerned with policy and best practice, business strategies and design solutions; to innovators in technology and materials. Weekly update day: Wednesday.

Curated and Managed by Jim McClelland @SustMeme, the data is published by McClelland Media Ltd, in association with the BESA @BESAGroup.

The Building Engineering Services Association (BESA) has evolved throughout the years to reflect the growing needs of its members, encompassing the specialist services available within the built environment. BESA has a proud heritage and has been most notably known as the Heating and Ventilating Contractors’ Association (HVCA) for nearly 50 years. BESA offers specialist services and advice, training and sector-specific apprenticeships - all tailored to support its entire membership, ranging from micro enterprises to the largest organisations within the industry.

The Leaderboard ranks Players on the basis of scores that measure interactions and influence across social media, with the metrics provided predominantly via leading independent platform Kred, plus an additional custom element.

The full menu of sectors and topics for which SustMeme Top 500 rankings are published, including impending launches, can be viewed here.

To nominate a person or organisation for potential inclusion on this ranking, please simply Tweet the Twitter Username of the nominee to @SustMemeTop500, using the hashtag #Top500ADDBuildingServices.

For all news of Top 500 releases, updates and peer group notifications, please Follow dedicated Twitter feed: @SustMemeTop500.