1> I think you've done a fairly good job here. Which is not
to say that it could not be further refined.
2> Not sure what this means. Sources? Outlets? Memes don't
come from or go to anywhere in particular, they just exist
within the meme-pool.
3> Seems to me awareness is always the biggest single factor.
Awareness of how advertisers and politicians try to manipulate
us (and very often succeed) has to be the best tool in
preventing such manipulation.
BTW, it may or may not be worth mentioning, I think that such
awareness is by the far the most important thing memetics can
do, and I don't think it needs to be particularly scientific in
order to do it.
-- Robin