social groups vs forums ???

[s.kallima]

I am a bit lost with all the new social groups starting discussions on species or group of species, and these discussions could as well be in the regular forums which have already a lot of categories...
And when I get online, I check the new posts with the regular command, and the ones in social groups don't appear anywhere, so I miss all these new social group threads...
It looks to me like if social groups and forum are 2 different worlds, but talking about the same things , or like if social groups are reinventing the forums

Am I the only one in this case ?? Maybe I missed some explanation about the links between these 2 worlds...