How does a social network go from 900,000 daily users to 7.6 million daily users in just six months?

One way is to get acquired by Facebook. Another way is to be an awesomely powerful marketing tool for brands.

Instagram did both, and as of this week, they have surpassed the second largest social media network in the world on mobile.

Also, you probably lost some Facebook fans this week and there’s nothing you can do about it. (Don’t worry; it’s not your fault!)

Read about these top stories and more in this week’s marketing news roundup.

1. Instagram beat out Twitter in August mobile usage

A new report from ComScore this week found that, for the first time, Instagram beat out Twitter in daily mobile usage. According to the report, Instagram averaged 7.3 million daily active users in the month of August, while Twitter averaged 6.87 million. Instagram users also spent 44% more time on the photo-sharing app than Twitter users.

Bottom Line: Don’t worry Twitter fans, you don’t have anything to worry about—most of those photos taken on Instagram probably made their way to Twitter eventually.

But what this does show is that Instagram is seeing impressive traffic—enough to challenge the second largest social network in the world. Plenty of small businesses have already had success with using Instagram to market their business, and it could be time for you to consider giving it a shot.

2. Facebook wipes out thousands of fake accounts; Pages lose fans

On Wednesday, Facebook fulfilled its promise to purge its network of thousands of fake accounts. Facebook said in a statement that the average Page would lose less than 1% of its fans, but some sites with  a higher fanbase have seen fan counts drop by the thousands.

The move is intended to cut down on spam, malware, and compromised accounts.

Bottom Line: As a small business, it’s unlikely that you noticed much of an impact from Facebook’s push to wipe out spam accounts. But even if you have experienced a noticeable drop in fans, you shouldn’t be concerned. The value of a Facebook fanbase isn’t always based on the amount of fans, but rather by the quality.

Of course, you always want to continue to work to grow your presence and extend your reach on Facebook, but without active and engaged users seeing your content, your Page won’t generate the results you’re looking for.

3. LinkedIn introduces one click Endorsements

LinkedIn introduced a new feature this week that will allow users to endorse the skills and experience of other users with a single click. “LinkedIn Endorsements” works in the same way as “LinkedIn Recommendations,” but without the personalized written message.

Each LinkedIn user will have five auto-generated “Skills and Experience” options that will show up when someone visits their page. Users can also enter different options if they wish to endorse another area of that user’s expertise.

Bottom Line: As an individual, “LinkedIn Endorsements” are another way to showcase your talents and expertise. As a business owner, it’s a great resource for finding qualified employees or to strengthen relationships with colleagues. Learn more about One Click Endorsements.

4. [Infographic] 50% of consumers value a brand’s Facebook Page more than its website

A new study from market research company Lab42, has found that 50% of consumers find brand Facebook Pages more helpful than brand websites. The study surveyed 1,000 participants and found a number of revealing facts about how consumers are interacting with brands on Facebook.

According to the study:

  • 82% of people find Facebook to be a useful place to interact with brands
  • 75% feel more connected to brands they “like” on Facebook
  • 69% have “liked” a Page because a friend did

Bottom Line: It’s no secret that Facebook has become a valued resource for small businesses and a place that consumers turn for more information about the brands they know and love. That’s not to say your website won’t be a valuable resource for your brand (71% of SMBs find website marketing to be their most effective marketing tool). But it reinforces the value of having a Page that reflects the quality of your brand and provides customers with the information they need most. Here are 10 things you need to do when setting up your Page.

5. New Google research reinforces the importance of mobile-friendly websites

New research from Google this week, provided some revealing details about the importance of having a website that’s “mobile-friendly.” According to Google, two-thirds of smartphone users say a mobile-friendly site makes them more likely to buy a company’s product or service, while 74% say they’re more likely to return to the site later.

On the other side, 61% said they will leave a mobile site if they are unable to find what they’re looking for quickly and easily.

Bottom Line: The fact is, if your site isn’t working for your customers—regardless if they’re viewing it on a laptop, tablet, or smartphone—you’re going to miss out on opportunities to grow your business. Of the 1,100 US adult smartphone users that were surveyed, half said they’ll visit a site less often if it doesn’t work on their smartphone.

With more than half of all Americans now using smartphones, it’s never been more important to commit to going mobile.

What news stories caught your eye this week? Let us know in the comments.