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Does creating a meetup group match your needs? Has a few more functions than FB.
https://www.meetup.com/ -
What are the future plans for Microcosm, is there ongoing support development?
It will continue to exist, and is having ongoing development to keep it relevant, for the foreseeable future (up to 5 years at least).
It's open source, and the key thing is that the instance on which LFGSS and the other microcosm sites is running is able to sustain itself financially. It is doing this through donations. For as long as it is financially viable in a self-supporting non-profit way, it will exist.
Improvements are being made to make it cheaper to run, and if it ever did look like it would shut down you would have access to the software (you do already, but it's hard to install today) and could then install your own version.
If you're in any way uncomfortable with this, go for Facebook and nothing else. If you're cool with what Microcosm is today, and OK about the worst case being to install the software yourself, then feel free to run a site on here, for the size you mention it would be free but donations are welcome.
Its a smallish site; 200 members.
Non profit sports club.
What are the future plans for Microcosm, is there ongoing support development?
The parent company of our current solution is now insolvent and looks like the service will be closed down or sold off.
I want to reassure my club members any new solution isn't about to disappear also.
Currently looking at moving to FB as a stop gap solution.
Also looking at Teamer.
Does anyone have any experience of them?
http://teamer.net/