Subtle differences addressed in clear definitions like the two you describe here really help to discuss these topics.

@IdoNotes : I like the term aggregation but it's is also too attached to another topic. It's a commonly used in term with regard to news feeds, so I think it doesn't clear the confusion.

@ozten : Activity Streams is another good term, but again I see it attached to Drupal more than anything else, but could definitely be used.

@eschnou : Hoping to get bought up? hehe.

@Richard Cunningham : I agree that what socialstreaming is, is the aggregation of lifestreams, but using the term aggregation is cumbersome and broad. Lifestreaming could be defined in the terms of aggregation as well. Lifestream is catchy and without a formal definition someone can understand the gist of it, I argue this other use needs identifying nomenclature as well.

Now… the technology foundation is similar of course, so there is a lot of potential synergies between both services. Friendfeed acquiring Storytlr would make a fantastic service

I think that 'Socialstreams' are a natural evolution for displaying public, useful bits of Lifestreams. We can have amazing communities of practice instead of lonely silos.

Having a lifestream to keep track of everything I did.(only sharing some of them…)
Then have one (or many) socialstream to keep track of everything other people did that I care about.

There need a open standard… and some implementation of it…