Bits

bit: Bits are the main currency in My Little Pony.

Bits can be gained in a big variety of ways, but the main source of income is collecting products from Shops.
 * Selling stores or decor (except for trees and certain other items) bought with bit will refund a portion of their original price. This works even for preplaced decor such as Dirt Paths.
 * Completing quests and gaining levels both reward bit.
 * Finding Derpy rewards a decent amount of bit.
 * Defeating Parasprites and Changelings can reward a decent amount of bit.
 * Playing every day grants a bonus which always includes some bit.
 * Once a Harmony Stone is activated, spare shards can be spent at it for extrabit. This should be done in large amounts at the same time because there are additional rewards for every 10th and 100th shard spent in one session, including the chance for a gem in the latter case.
 * Tapping any piece of decor can cause them to drop a single bit.
 * While the regular minigames with the ponies cost at least 100 bit, the "Clear the Skies" minigame played when reaching a full star is free and grants you the opportunity to earn some bits.
 * The Balloon Pop prices include varying amounts of bit, especially the free version.

Bits are used for:
 * Buying a variety of stores, decor and ponies
 * Playing with the ponies with the x1 (100 bit) or x2 (1000 bit) experience modifier
 * Removing obstacles (200-16000 bit depending on the obstacle)
 * Purchasing land expansions (though this can also be done with gems)

Some quests will also require you to earn a number of bit but this won't consume them.