I shall miss these forums too.
I wonder if the difficulty people had in adding images frightened many away?
There are far easier, user friendly sites on www.
I do not/will not be using Face book.
As for other forums ... may I recommend .....
1. "The University of British Columbia Garden Forums" for those that want a serious site with very knowledgeable pros especialy on the Plant id section.( on there I feel like a complete novice, compared to the real experts!)
2. For a UK site...light hearted, friendy and fun then "Gardeners Corner" is good.
3. Then Flickr has a hard core of reliable people world wide willing to help.
3A. Unidentified flowers and plants.
3B.What flower is this?
3C.What plant is that?
4. For more exotic plants there is a very active, knowledgeable, helpful group... "Growing on the Edge."
I hope people here will find one that is helpful and suits there needs.
Sorry for delay in adding other links .. Internet went down. S.S.