What is the "Feed aggregator"???

I noticed that there are *other* message (Threads) in the section entitled: "Feed Aggregator".

What is this section and where are the messages for those threads from???

Curiosity brought me to that section (first time I noticed it) and when I started reading, I read a message from a chap willing to do blind playtesting of games (WIPs)...

Anyhow, those messages seem to have relevance - but seem somehow *lost* in that "section"... I know I will check that section every now and then to see updates... In case there are other interesting posts.

Thank you!