Found a couple of new (to me, anyway) long-hair Yahoo Groups:

health.groups.yahoo.com/group/girlswithlonguncuthair/

health.groups.yahoo.com/group/longsatinysilkyandbeautiful/

Second one seems off to a bit of a slow start, but might be worth monitoring to see what happens.

Also, a website: fivestarlonghair.com/

And, a forum: 5starlonghair.proboards12.com/

(very "G" rated, I suspect)