Couple of quick terms for you to play with, and no apologies for butchering the English language, it likes it really.
Riffability – the potential for a resource or idea to generate quick modifications, for it to be riffed upon by others.
Riffability is one (but not the only) factor for how memes, ideas or social objects work. If something has a high riffability rating, then it means others will modify it, suggest alterations, or explore ideas around it. Not everything that spreads is riffable – some ideas/outputs are just perfect as they are and you just want to share. Others promote debate and discussion, but that's not the same as riffing.
A few examples: one of my Cardiff twitter contacts, Sianz, produces food/object based visual puns in twitpic. These are very riffable I think, and thus the photos themselves act as social objects around which others congregate.
The discussion I had (particularly with Andy) on metrics is an example of something that isn't riffing, it's debating (or just plain arguing). But had I couched the original post in the sense of 'here's some metrics I'd use', then it might have been more riffable, in that others could have pitched in with their suggestions. When Scott Leslie was preparing his Educator as DJ talk, it was a riff which some of us could work with.
So I think some ideas have more riffability than others, and you can pose your idea in a manner that has greater riffability. If your intention is to get input from others, then learning how to inject a bit of riffability may be a developing skill (when HR consultants offer courses on 'Improving Riffability' I'll know the term has made it).
MPO – Multiple Personality Order (as contrasted with Disorder). Following on from my last post, comments from Pete J and Jim G, questioned whether we only had one online personality and whether we weren't all a bit schizophrenic. I think they're right, my final conclusion that 'your academic identity = your online identity' was too simplistic. Your online academic identity will be a subset of your online identities. I follow a few people on twitter for instance who have a professional and a personal id (you know who you are). Sadly, their professional one is, well, a bit boring compared with their personal one. But I think this reiterates what I was trying to say in my talk on identity – we're still at the beginning of all this.
Increasingly people (particularly teenagers) will develop and cultivate multiple personalities online. This is an astute, and dexterous, thing to do. It allows them to have a pseudonym which might be the identity where they can mess about, swear, talk rubbish and connect only with trusted friends and like-minded people. At the same time they can have at least one other personality which is a more public facing one, which is closely allied to the real identity.
Of course, many people do this very well at the moment, and some environments (virtual worlds in particular) actively encourage a separation of 'real' identity and online one. My conjecture is that it will become the norm, and take place in more publicly social spaces. And it is likely people won't stop at two identities, but have many. When you add into this that people find you in different spaces and so may have one facet of your personality exaggerated (eg if you follow someone in LastFM but not twitter, you would have a different impression of them), then defining what exactly is 'your identity' becomes increasingly difficult.
But this is a good thing and just a natural adaptation (I'm not doing a Greenfield and arguing social networks will cause MPD). I've always found the sort of person who prides themselves on only having one aspect to their personality rather odd, those people who declare 'I'm me, take me or leave me, I call a spade a spade' etc. Being able to nuance your behaviour to a given environment (without being completely false) is a skill. And online, when stuff hangs around forever and can be spread globally in an instant, being adept at doing this will be increasingly significant.