Around the same time, Pump.io's ActivityPump protocol was being built upon by a number of experts to form the W3C standard ActivityPub. Mastodon, Friendica, and Pleroma were eager to adopt the new standard, even before it was formally published, and eventually Mastodon and Pleroma would drop their support for OStatus. The Fediverse would continue to expand and new platforms were developed - PeerTube for video sharing, Pixelfed for image sharing, BookWyrm for book reviewing, etc.