The multiple domain spam thing really bugs me, I'm seeing that a lot with one or two competitors of mine who Google seem to love at the moment.
If I'm searching for something such as "what's the capital of Turkey", I will visit one site for my answer. If I'm searching for information on "diabetes", I like to visit 5-10 sites to get a wide range of information. I don't think one site will give you everything you need to know. So it really ticks me off when you search for something and the same site has several listings in the top 10 on Google.
I read that younger people tend to use social networks or Youtube more for searching. My 10 year old daughter almost never uses search engines, just goes to Youtube. I will use search for something like "diabetes" but will go to Youtube for "how to" information. Visual is better for that, but for information, I like to sit and read.
I see Facebook show up quite often as a referral, but nowhere near as much as the search engines. But I will keep plugging away. I need to look into Pinterest and all that stuff too. I'm still very old school, haven't quite caught up with all these latest networks.