What does "tag" mean in "My Tags?"

The following is the My Tags of one the A2K members. The tags are so many that I wonder what exact meaning of the word tag is here:

My Tags
Politics, Humor, Conservative Whiners, History, Spirituality And Religion, Philosophy, International News, Gunga Pseudo-News, Gunga Pseudoscience, Food And Drink, Viral Marketing Attempt, I Hate Jews, Captain Obsesso, North America, Conservative Sore Losers, Partian Hysteria, I Hate Israel, Conservative Panic, English, News, Pets And Garden, Taking The Piss, Music, Environment, Bait Thread, able2know, Relationships, Gunga Pseudonews, Human Interest Stories, Viral Marketing, Conservative Whiner, Australia, Science And Math, Trivia And Word Games, Gunga Hysteria, Sick Gun Obsession, Incoherent, Parenting And Childcare, International Snooze, Get A Life, Books, Conspiracy Paranoia, Canada, Pseudo-Science, Sports, Drama Queen, Puh-Leeze, Poetry, Movies, Self Amuse, Cats Is The Spawn Of Satan, Life At Work, Computers, There Is One Born Every Minute, Neo-Nazi Obsession, Lil Trix Sux Dix, Jew Hater, Sick Cw Obsession, Internet, Bellas Got A Heart On, I Hate Muslims, Wanna Buy A Bridge, Latin Translation, Conservative Hysteria, Attention Whore, Canadian Politics, Europe, Fsb Troll, Partisan Hysteria, Cant Tell Freedom From License, Girls Scare Me, Asia, Trying To Pick A Fight, Troll Out Of Control, Gun Obsession--Again, Dairy Queen, Business And Technology, Pc Games, Science, Community, Evil-Lution, Fossils, Newfoundland, Penis Evny, Did Anyone Tag This Satire Yet, Shameless Hater Of Jews, Jaysus Presairve Us All, Viral Martketing Attempt, Smart Phones, Twin Of Pamela Rosa, Queen Of Spades, Original Writing, Well I-Ll Be Dog-Goned, Religion, Right Wing Pope, Anti-Semitism, Missing Link, Genetics, Rug Munchers, Cougar