Skype: Pseudonym (this one)
Twitter: Pseudonym (the same)
Reddit: Pseudonym (the same)
AIM: Uhm.. Nope. Guess allows pseudonyms? Not sure
GMail: No restrictions either
G+: Same as FB, hopefully the next target on the list of this group.
So - most of your list aren't playing that 'give us your real name and be prepared to hand over your ID to prove that fact' game with their users. Which is what the discussion is about. Of the services that do this, FB clearly is the leader. Or in a monopoly-esque situation.We really have completely different views and probably (and 50% is certainly on me) trouble understanding each other.
Microsoft was (is!) a monopoly. Although you can buy OS X, get Linux, FreeBSD, OpenBSD, NetBSD, Nexenta, SmartOS, Solaris, Haiku-OS or whatever floats your boat. [1]
Facebook is a monopoly, even if there are products/services available that provide something kind-of, sort-of similar.
1: Apologies for missing someone's favorite alternative OS in the list
Google plus and Twitter are closer, but a Twitter handle is not drop in replacement for Facebook group. That just leaves Google plus.
And Google plus has around 0.5% of the German population as users.
0.5% vs 30%... not a replacement exactly. almost like saying that AOL search is a replacement for Google search. However, I think the ad networks do not agree with that.