Jacob Stoops provides what he calls "the ultimate guide to link building." In a lengthy post, he defines on-site and off-site SEO, and dives into defining link building and PageRank. Following the basics, Stoops gets into why links are important, and provides a list of social media tools that can help you build them.

Google added a Target CPA bidding option in AdWords to accommodate marketers who think in terms of "a target" or "average CPA" when it comes to managing online advertising. With Target CPA Bidding, marketers can set a bid that reflects the average amount they would like to pay for a conversion, rather than the maximum they're willing to pay. Emily Williams explains where to find the option and how to use it.

What one recommendation would you share with small business owners to improve their online presence? Answer that question on Bruce Clay's site and get entered to win a three-day pass to the Search Engine Strategies conference in San Francisco, as well as a seat in his company's SEO training class.

Dave Cosper tells us you can now add custom links to business profiles in Google Places. Until now Google only permitted one Web site link, which the search engine believed should represent the business best. Cosper points to the type of link information that works well, and provides screen shots to help you visualize the change.

Arnold Zafra tells us about a virtual keyboard from Google that lets you search in your own language even if the physical computer you're using is in a different language you don't understand. The tool offers searches in more than 20 languages.

Chris Chrum asks if "likes" and "retweets" are the new search engine links. He explains no one suggests links are dying or dead, but Twitter is cannibalizing the Web's link graph. Well, that's according to SEOmoz's Rand Fishkin, whom Chrum caught up with even before Facebook announced its plans to take over the Web. Chrum points to why some believe Google and search won't dominate the next decade, and ponders if Facebook's "likes" may not translate to better Google rankings.

Having the ability to contextually comprehend search phrases give engines a boost. Here are seven semantic search engines you might want to know. Nancy Messieh offers up insights into each, along with a screen shot to show you what to expect. Using a semantic search engine will ensure more relevant results based on the engine's ability to understand the definition of words and terms being searched for, she writes.