An important aspect in networking is thanking people and also acknowledging them.
You can send a card, an e-card, a letter, an e-mail, maybe even a small gift.
Or … you can give someone a standing ovation.
The website Playfair gives you the tool: http://www.playfair.com/standingO/send.htm
If you speak Dutch you can also use the “Schouderklopjes” on the website of Prana: http://www.prana.be/schouderklopjes.htm
Have a great networking week !