It's a matter of scale i think. In small communities, you're not really anonymous in the same way as on facebook. You might only be known as DataDog213 on some forum with a hundred members, but the people there know you and who you are as a person.
In facebook groups with thousands of members with no real bar or entry, you're really anonymous and no more distinctive than anyone else if you don't make yourself stand out. (By bar of entry, I mean things like even finding the site in the first place)
In facebook groups with thousands of members with no real bar or entry, you're really anonymous and no more distinctive than anyone else if you don't make yourself stand out. (By bar of entry, I mean things like even finding the site in the first place)