One of the most critical tools for Facebook’s continued growth is the company’s friend importer tool and recently the company has increased efforts to drive users to interact with the feature. Whether through Skype invites, or various invite scores, Facebook is doing all they can to drive user growth through invites.

As Facebook moves from 500 million users toward 1 billion users, extreme focus on user growth optimization is critical. For smaller companies, paying attention to the minor tweaks that Facebook implements is valuable in learning some of the latest optimization techniques. In addition to having various prompts to invite friends, Facebook also regular notifies users that their friends have also used the tool, using the social proof techniques that we’ve previously covered.

As Ryan Spoon recently pointed out, Facebook has been getting aggressive with their Skype invite promotions, pushing them directly above the news feed. Over the past few weeks we’ve received a number of tips from readers who have seen similar promotions. Have you seen any of these call-to-actions which are focused on driving increased friend import usage?

Thanks to Kien Lee of Senatus for sending us the tip!