There certainly are, however, the number of users was never as large as many of the higher estimates (based on accounts and registrations). A huge number of those were always multiple accounts owned by one person or scam/bulk registrations. Even things like commenters was massively inflated by comment bots at one point. In terms of real, active human users it seems like 2000 might be a reasonable estimate for the peak and something like 1000 now.