depends on the situation. a simple verbal "Thank you" is enough for social interaction. if someone did something very nice you could send them a card, a gift, money. just to say thank you for whatever they did.
~Say thanks or thank you in person or by phone
~Get flowers or chocolates for the person you're thanking
~Write a letter, email or SMS to thank the person
~Describe what you appreciate about what the person did
~Do something nice for the person in return
~Give money
~Be warm and welcoming and sincere
To say "Thank you" it is: "Misotra". To say "Thank you very much" it is: "Misotra betsaka"
for please they say please, and for thank you they say thank you...
In Pampango, you can say "Salamat" to say thank you.
In Hindustani, you can say "shukriya" to say thank you.
You can say "Enkosi" to say 'thank you' in Xhosa.
In Colombia, you can say "gracias" to say thank you.
How to say THANK YOU in Tagalog: Salamat
In the Philippines, you can say "Salamat" to express gratitude and say thank you.
In Dene, you can say "Mahsi cho" to say thank you.
In Berber, you can say "Tanemmirt" to say thank you.
In Tyrolean, you can say "Vergelt's Gott" to say thank you.
In Cambodia, you can say "Aw-kohn" to say thank you.