The last update added weekly circle competitions. At the end of the period of the competition, if your circle hits a points threshold, you will gain one of four possible rewards for that point tier. It seems these competitions will be run weekly.

You gain points by doing any of the following:

• Check circle daily - 300 points (once per day)
• 3 daily messages on circle board - 100 points per message
• Attacking exceptionals and irregulars. Points differ based on the target hit. Each Exceptional gives you some 20 - 30 points.
• Formula for determining points gain by fighting Irregulars is (Level of Irregular x 2) 4. For example, a Level 23 Sebastian gives (23 x 2) 4 = 50 points.
• Certain days have double points gains, usually based on the element of the that day's daily classes.

Currently these are my suggestions for points farming:

• Sebastian (Chapter 1) - Do any Chapter 1 Exploration where Seed of Flame is a reward, and you should encounter Sebastian from time to time. Sebastian himself is not particularly noteworthy, but he gives 50 points per 7 MP spent, which is so far the most efficient I've seen yet. Seeds of Flames can be used to make Small MP Potions so you can fight more.
• Sanzang (Chapter 3) - Notably, getting Level 70 8/8 Sanzang nets you a free title. Not a particularly outstanding unit as a whole.
• Thor (Chapter 4) - For a farmable unit, has one of the best skills in the game (similar to Nero's - 200/240/280% increase in servant's ATK, regardless of enemy's element). Gives roughly 100 points per 15 MP spent.
• Fabre (Chapter 5) - 8/8/ maxed Fabre nets you a title. Doesn't seem to do much more than that however.

Rewards:

Every person in the Circle will get one of the items in the listed tier, based on which tier their circle is in at the end of the week. For example, person A in one circle gets Summon Tickets, but person B in the same circle gets Gold. But it will be within the same tiers.

A tier (1, 000, 000 points or above):

• 300 - 3000 Crystals
• 13000 - 130000 Gold
• 10 - 25 Servant Tickets
• 1 - 10 EXP Jokers (L)

B tier (500, 000 - 999, 999 points):

• 200 - 2000 Crystals
• 8000 - 80000 Gold
• 8 - 15 Servant Tickets
• 5 - 15 EXP Jokers (M)

C tier (250, 000 - 499, 999 points):

• 100 - 1000 Crystals
• 5000 - 50000 Gold
• 5 - 15 Servant Tickets
• 1 - 10 EXP Jokers (M)

D tier (100, 000 - 249, 999 points):

• 50 - 300 Crystals
• 2500 - 25000 Gold
• 3 - 10 Servant Tickets
• 1 - 10 EXP Jokers (S)

E tier (10, 000 - 99, 999 points):

• 20 - 100 Crystals
• 1000 - 5000 Gold
• 1 - 5 Servant Tickets

We have a subreddit-based Circle called "Lewdsid", let me or /u/Maverino know if you'd like to be invited (lots of free space for active players).