Wikia

Each gift of respect gives you a +5% to your respect meter for level 0, and +5% each level thereafter.
Each gift of disrespect gives you -10% to your respect meter.
Everytime your meter reaches 100%, you gain a level of respect.

Gifting Reward

When sending gifts to your friends, you may select a reward. You can get Experience, Energy, or Stamina. The values can be calculated with the following formulas:

$\text{Experience} = \max \left( 25 , \min \left( \left\lfloor \frac { \text{Level} } {3} \right\rceil , 100 \right) \right)$

$\text{Energy} = \max \left( 15 , \min \left( \left\lfloor \frac { \text{Level} } {5} \right\rceil , 50 \right) \right)$

Level	Amount	Level	Amount	Amount
Experience		Energy		Stamina
1-74	25	1-74	15	10
75-300	Level/3	75-250	Level/5
301+	100	251+	50

The stamina reward is always 10.

2nd Generation Gift Safe House Add-On

Date Available: February 23, 2010

Respect Meter is introduced

Respect Level Bonus

Name	Attack	Defense	Acquired
Water Gun	18	12	Sign of disrespect
Switchblade	14	16	Respect Level 0 Completed
Grach	20	10	Respect Level 1 Completed
Puggio	17	23	Respect Level 2 Completed
Zip Gun	24	16	Respect Level 3 Completed
Samurai Helmet	12	28	Respect Level 4 Completed
Ma Barker's Machine Gun	30	20	Respect Level 5 Completed
Ghillie Suit	16	42	Respect Level 6 Completed

After completing level 6, you can continue to receive gifts and increase your respect level. However, you will not get additional reward items for completing level 7 and above.

Weapons

Broken Bottle 21 9 30
Set of Frankenstein Poker Chips 22 10 32
Hedge Clippers 24 6 30
Kunai 18 12 30
Machine Gun Kelly's Gun 25 14 39
Ru-357 Pistola 26 24 50
Pea Shooter 26 12 38
Pro's 2 Iron 24 19 43
Stuffed Turkey 19 25 44

Armor

Bandanna 11 19 30
Gene Splicer 27 16 43
Tigerskin Armored Vest 12 25 37

Valentine's Day 2010 Special

Date Available: February 9, 2010

Love Meter is introduced

Mastery Loot

You can get up to 3 cupids as reward.

Name	Attack	Defense
Cupid	46	27

Disrespect Loot

Name	Attack	Defense
Box of Rotten Chocolates	21	14
Pair of Wilted Roses	13	16

2nd Generation Gift Safe House

Date Available: January 12, 2010

You have a maximum of 10 slots this time, and as long as you have an open slot you can keep receiving new gifts.
Access to the Gift Safe House was temporarily removed at 11:59 PM Pacific on January 31, 2010. It was restored later on February 1, 2010.