Google's search algorithms are constantly evolving to keep up with changeable nature of the web in an effort to keep spammers at bay. What many people don't realize, though, is that a search engine optimization strategy that worked well in the past may now get your site blacklisted from Google's results.

Many SEO strategies that were once successful ways to maintain a search presence are now considered unethical by Google. If you've seen your search results falter and you haven't taken a look at your site back-end in a while, now might be a good time to root out any old SEO tactics and update them with a current strategy.

Foursquare, National Post and GeoPollster Canada have partnered to create a fascinating social media campaign in the run up to the Canadian General Elections on May 2. The campaign acts as a game of location domination, pairing Foursquare users with a political party and displaying their check-in data as party affiliation.

How does it work?

Foursquare users opt to sign in to the GeoPollster Canada campaign, which links with their Foursquare account. Once account permission has been given, the user is prompted to choose a party to "vote" as, and every Foursquare check-in from then on is associated with that party.