follow-back. On twitter when you see something as 'follback' it means follow back. When someone followed you on twitter and he/she said 'follback' it means he/she wanted you to follow him/her also. Usually you don't know these people, they just want to get more followers. Most of them are fucking nolifers.
Megan tweets: @rosie yo follow me, i will follback
rosie tweets: @megan no way, i don't need it. get a life!
The feedback one gets from people who tried food prepared by them. Can be both positive and negative. Or simply confusing. Depends greatly on the feedback-giving person. And, of course, on the dish.
April: I love your chocolate cake. Especially the frosting... and the cute, little sugary flowers you put on top...
Maya: Well, thank you for your foodback.
Lots of feedback. This could be multiplepieces of feedback to the same person or entity (1:N), or multiple pieces of feedback across multiple people or entities (N:N)