In the last few days I thought, I'm really going for it; Facebook, Twitter etc., and I basically doubled my site traffic. Net result? Almost no more on site sales.
The lesson here (for me anyway) is; I'd rather have 200 uniques per day who have found me organically. and are therefore pretty close to what I'm offering, than 500 hits just because I posted something unusual/funny.
These extra hits aren't free of course (in terms of time). I'm sticking to SEO and the core work I was doing in future.
My advice to anyone who wants to see that Analytics spike higher is concentrate on people who are likely to buy from you, not numbers.
Just thought I'd give my input.