Although the terms acknowledgement and appreciation are used often interchangeably, they are different concepts.
Acknowledgement is a formal statement of recognition of a contribution or achievement. It often involves giving credit or recognition of someone's work, effort or contribution. It could be public or private. Acknowledgement is typically done with awards, ceremonies, in political speeches or in public forums.
Appreciation is an expression of admiration or admiration of someone or something. It is a feeling of thankfulness, respect or admiration and it can be expressed both publicly and in private. Appreciation is typically done through a handshake, a kind word, a written note or simply saying ‘thank you’.
In summary, acknowledgement is a formal statement of recognition and appreciation is an expression of admiration or thankfulness.
Forums can appear to be very impersonal, so it is nice to be acknowledged and appreciated for the contributions we make.