I agree with Mulberry – our wants and needs do change of time, particularly when it comes down to things like Facebook. Some support groups are great (as ree2112 notes, SCT recovery chart etc) but when members post of those passing, it can be very distressing and triggering to those that have been diagnosed recently and have joined these groups for support.
I always look to the Myeloma website for up to date information about diagnosis & prognosis because, as we all know, it is now more frequently being treated and referred to as a chronic illness.
If in doubt, speak to your team is what I say.