As of today (2021/07/20) this is a full list of all the AddToAny Service codes taken from: https://www.addtoany.com/services/
"amazon_wish_list",
"aol_mail",
"balatarin",
"bibsonomy",
"bitty_browser",
"blogger",
"blogmarks",
"bookmarks_fr",
"box_net",
"buffer",
"care2_news",
"citeulike",
"copy_link",
"design_float",
"diary_ru",
"diaspora",
"digg",
"diigo",
"douban",
"draugiem",
"dzone",
"email",
"evernote",
"facebook",
"facebook_messenger",
"fark",
"flipboard",
"folkd",
"google_bookmarks",
"google_classroom",
"google_gmail",
"hacker_news",
"hatena",
"houzz",
"instapaper",
"kakao",
"kik",
"kindle_it",
"known",
"line",
"linkedin",
"livejournal",
"mail_ru",
"mastodon",
"mendeley",
"meneame",
"mewe",
"mix",
"mixi",
"myspace",
"netvouz",
"odnoklassniki",
"outlook_com",
"papaly",
"pinboard",
"pinterest",
"plurk",
"pocket",
"print",
"printfriendly",
"protopage_bookmarks",
"pusha",
"qzone",
"reddit",
"rediff",
"refind",
"renren",
"sina_weibo",
"sitejot",
"skype",
"slashdot",
"sms",
"stocktwits",
"svejo",
"symbaloo_bookmarks",
"telegram",
"threema",
"trello",
"tuenti",
"tumblr",
"twiddla",
"twitter",
"typepad_post",
"viadeo",
"viber",
"vk",
"wanelo",
"wechat",
"whatsapp",
"wordpress",
"wykop",
"xing",
"yahoo_mail",
"yoolink",
"yummly"
Helpful for customization such as excluding services: https://www.addtoany.com/buttons/customize/remove_services