You can easily find your own score by klicking on "Friends".

There are high-scores for the events, e.g. "Christmas Level", "Alchemy level" they only show when the event is active but the actual high-score seems to be kept the next time that event comes around.

There is also the highscore named "Total collected Crafting Lore". You have to click on "All-Time" to see the scores. However, if you click on "Today" it will probably say that a player's score is 2,000,000. That does not mean that the player has collected 2,000,000 Crafting Lore in one day. It means that the player has played the game the last day and has collected 1 or more Crafting Lore. His new total amount of Crafting Lore is 2,000,000.