The advantage of the newsgroup sci.physics.relativity has the advantage of to be more open.
The disadvantage is that many postings are not resulting in any true discussion.
Many postings only contain one message.
Reflection 2 - Overview
The tread: "the self destruction of a newsgroup" discusses
Twin paradox. Specific:
21 Clock behaviour is GEOMETRY
In this postings 2 clocks are discussed which innerworkings are different
The book Space-Time physics:
43 Space-Time physics
Tom gives his opinion that he book Space-Time physics is too complicated
Length contraction. Specific:
51 Length contraction in side clock
THe question is if the behaviour is influenced by physical Length Contraction
Length contraction. Specific:
54 Length contraction in side LHC
Mentions that there is Physical length contraction in a storage ring
The problem is that most of the text is written without any experimental prove. The prove is embedded in mathematics.
The tread: "An open letter to Mr. Ross A. Finlayson" discusses
Feynmann diagrams. Specific:
16 Feynmann diagrams in 3 steps
The issue is that Feynmann diagrams are an abstraction. Reality is more complicated.
Reflection 3 "Usenet - General Review"
The present state of Usenet is a mess. Most of the postings are carbage in the sense that they are completely unrelated to the subject of the thread. In many cases it is pure advertising.
IMO the only solution is to introduce a certain level of moderation. I think the fact that a certain level of external control is introduced will be helpfull.
To get an impression of the pitfalls in moderation read this: https://www.eyrie.org/~eagle/faqs/