message board 
noun
An Internet site where users can post comments about a particular issue or topic and reply to other users' postings.An Internet message board has been pulled amid allegations it was used by bullies to harass and victimise school children....
- Well isn't nice that we can post our responses to an internet message board instead of freezing in a cell?
- My Internet bird message board has been bombarding me with articles on why gravel is bad.