Given that SN has over 100,000 members and SH has around 800 it is only to be expected that there will be less activity in all fields on SH.
I, for one, hope that SH continues to gather members with a commensurate rise in gallery postings and comments but it will take time.
Following the recent SN debacle I no longer post photos to the SN site but I do look in to see what others have been up to.
My reasons for posting photos are (a) in case others are interested (b) that those photos will hopefully last longer than me when the kids put the originals over the side one day.
