One of them is kind of entertaining. I've been saying for a long time that Querki Is Not A Social Network, and I still mean that: between FB, G+, LJ, Twitter and so on, there are more than enough social networks out there, and I would rather that Querki work *with* those existing networks instead of trying to duplicate their functionality. Frankly, I've long been annoyed at the trend for every freaking service to create its own little special-snowflake "social network": social networks are an underlying infrastructure that should be widely shared.
(Yes, the big names are annoyingly commercial, evil and privacy-violating. One problem at a time -- the principle is correct, but we need some more disruption in the social-network space. But I digress...)
The thing is, though, I've started to realize that Querki *does* have its own "social network", just one that is very different from the big players. This is the network of shared acquaintance through shared Spaces. That is, if you and I are both in Space Foobar, that is a non-trivial connection. More importantly, Querki should make it easy for me to invite you to join one of *my* Spaces, similarly to how I would do with a Facebook friend or something like that. It's essentially an *implicit* social network, more like the one that exists in Facebook Groups than the actual FB friendlist.
I'm implementing the first draft of that now (frankly, I'm tired of having to look up peoples' email addresses over and over), but I'm trying to find the right term for this relationship. "Friend" is too strong -- this network is defined as "People I share Spaces with", and many of those aren't really "friends". But "Acquaintance" is kind of bloodless. (And has too many syllables.)