I know everyone favours Google for PPC, and I use it myself, but what are the others really like? I've heard people say that LinkedIn is too expensive, Yahoo will get you less impressions/clicks, and more so for Bing, and Facebook is not suited for many industries. Is there anyone who has used/is using all, and can give me a first hand idea of what the major differences are? Is it worth advertising in more than one with PPC? Perhaps if there a less clicks, but less costs I would consider it, but at the moment, I'm trying to find some good opinions and comparisons of the major PPC players. Are there any other major ones other than the ones I've mentioned? Many Thanks.