Social search is not new. People have been using such sites as Digg or Del.icio.us for a rather long period when looking for something in the internet. But Yahoo! today combines both search based on math algorithms and on people opinion. A new search engine launched by Yahoo! today provides users with the possibility to ask other people’s advice along with using machine-generated results.

For sure, when it goes about some questions that are important for you or that demand some decision you’d rather rely on people’s opinion then on answers given by search algorithm. New service from Yahoo! is based on Yahoo! Answers an is the newest and the best place to share your thoughts on one or another point and to collaborate online.

In UK the launch of new Yahoo! search engine will be accompanied by the launch of multimillion-pound advertising campaign with participation of many celebrity to promote the new service.

Good news both for publishers and those who want to expand their ads exposure. MSN has begun inviting customers to beta version of Microsoft Content Ads. Actually the invitation emails has already been sent to selected advertisers.

According to Microsoft representative the ads distribution is not limited to only MSN.com and will also spread to many other sites.

Content Ads is Microsoft’s next product that allows advertisers to place content-targeted, text-based advertisements primarily on Microsoft-owned properties including MSN Money, Real Estate, and many others within the www.msn.com portal.

Content ads will be as flexible as search ads utilizing geo- and demographic targeting, bidding tools and other conveniences.

So now advertisers and publishers can expect on a new big player on the contextual advertisinf scene and begin to use the pilot version of Microsoft Content Ads before it actually launches officially.