Anyone who identifies with the general concept behind the organization and think it's likely to be useful to them, within a few limits. The only restrictions in place at this time are:

• Your business must be legal. While being a drug dealer (for example) is undoubtedly alternative, providing networking opportunities for that sort of thing is liable to get us in trouble.
• Your business and your subcultural affinity must not be based around hatred or intolerance. I don't think anyone would doubt that Nazi skinheads, for example, are a subculture, but they're not one we want around here.