Eh it's decent. Not any real 'groups' that I've seen outside of Tallahassee (quite the drive)
I go to Panama City Mall every few weeks or so (I'm about an hour east of there) and I may run into one or two people my mallrat friends know that parkour.
As for online presence? I wouldn't count on tons, best bet would be to get out and find good spots to train.
I would guess all the guys I've met have been under 18, I've had a really hard time finding anyone but scene kids around here that do it. Could be my luck though.
Feel free to hit me up for it sometime though, I'm in Blountstown.
Once my motorcycle gets fixed it'll be easier to swing out that way.