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I was in SES Toronto this year and somebody from UK said Google's share in the search market is close to 90% so if you are tageting UK audiances it doesnt worth it to optimizae for the other engine, in Japan Yahoo is the leader, in north America especially USA Yahoo still has some good share
The dont mind buying/selling links for traffic purpose but they are against buying/selling links those pass PR juics (links that dont have the "nofollow" tag), if you want sell dofollow links my advice is to make them relevent to your website topic so it will look more naturla .. you can simply...
IF you want question solutions to gain linkse you can go after traditional solutions such as:
- Article syndication
- Directory submission
- Press releases
- etc
Whatever you want to do do it gradually, do not change the whole site strucutre/content overnight, make sure when you remove an old page to 301 redirect the old URL to the home page or any other page that has similar content.
Google webmasters guidlines is the offecial Google documntation they dont update it untill they are 100% sure about their poleciy, paid link is an example for that .. they have been telling people that it is against their TOS but the webmasters guidlines offecila page did not clealry said until...
I dont see it an issue to target the same keywords using two domains ... if some body searching for a term like "web design" and you have three domains/websites:
1- Offering web hosting
2- Offering SEO services
3- Offering Web design
Where is the problem in having three ads
That is an old post Goolge now can equally handles underscores and dashes (underscores do not apply to domains), when it comes to domain there is almost no difference but I will go for no dashes, it looks that Goolge started to use more than 2 dashes in the domain as a spam signal.
It is not recommended to do it this way but if there is a reason to do that them make sure that you are doing 301 redirection .. I am not sure why do you need the question mark at the end if you are not passing and variable