Social media moves so fast, it's hard to keep up. Here are the week's top stories in scan-friendly format:

  • Facebook Garnered US$ 1.86 Billion In Ad Revenue In 2010
  • Backupify Back Ups 136 Million Tweets And 713 Million Emails in 2010
  • Yammer Unveils Leaderboard Feature, Showing Top Members and More
  • Taxes May Drive Twitter Out of San Francisco

Facebook Garnered $1.86 Billion In Ad Revenue In 2010

eMarketer, a firm that tracks online marketing and advertising, revealed figures this week that shows Facebook generated almost US$ 2 billion in advertising revenue last year. Aside from virtual currencies and other income sources, this represents a huge income stream that the growing social networking giant has realized.

Revenue growth has been positive at Facebook and it shows no sign of slowing soon. With Facebook Credits, users can buy gift cards in grocery stores that can be used to buy virtual goods on Facebook, making virtual goods more accessible and mainstream. Also, Facebook is displaying more than 50 billion display ads per month, meaning there are many ad opportunities for firms of all sizes.

It's a bright future for Facebook and with usage numbers accelerating, the trend seems it like will remain positive. Facebook is a sticky service that continues to attract new users while keeping existing users engaged and curious.

Backupify Back Ups 136 Million Tweets And 713 Million Emails in 2010

One issue with Twitter and other social media tools is the problem of permanence. Most tweets, such as what you're doing at a certain moment or an instant thought, people don't care about; however, some tweets or memories are needed to be captured. The problem is, Twitter messages are not held long term and are often unavailable after a certain period of time. Backupify is a tool that helps solve this problem by archiving Tweets, emails and other messages.

According to the company, in 2010, the service archived a shocking amount of data during the year. Backupify has 122,000 users who generated 66 terabytes of data, which is a huge increase over the 2 terabytes that was held on January 1, 2010. That data consists of 136 million Tweets, 713 million emails and 92 million photos.

Backupify can backup data from services such as Twitter, Facebook, Gmail, Flickr, Blogger, WordPress and YouTube. Do you have any use to 'backup' your social media contributions? On the social web, items are definitely instant and temporary -- what solution do you employ?

Yammer Unveils Leaderboard Feature, Showing Top Members and More

Yammer is an enterprise-focused social network that has been covered well here on the Social Media Minute. The workplace micro-messaging service unvelled a very interesting feature called leaderboards. If your group or group of co-workers utilize Yammer, you can now see a leaderboard that shows top members, best posts and even most replied-to posts. Yammer's leaderboards use a bit of meta-data to show the most valuable contributions on a Yammer network.

In detail, leaderboards show these data points -- most liked members, most replied to members, members with the most posts, most replied-to threads and threads with the most participants. To score well on the leaderboards, users of Yammer networks simply need to engage and spawn interesting conversations.

As ReadWriteWeb points out, it would be great if this leaderboard feature was active on Twitter as well. The ability to programmatically see who the most valuable members of a conversation network and the best content on that network is a very attractive feature. Hopefully a third-party builds this type of ability on top of services such as Twitter and LinkedIn.

Taxes May Drive Twitter Out of San Francisco

San Francisco is a fantastic place to have a technology company. The city is a hotbed that is laden with smart and highly educated workers. However, Twitter is considering a move out of the city, down south to Brisbane, which is about 20 minutes south of downtown San Francisco.  What's driving the social media powerhouse out of San Francisco proper?  The answer is taxes.

Twitter is growing rapidly and the company has been adding to its workforce accordingly. Twitter has been trying to work with the City of San Francisco to help reduce it's payroll tax in an effort to stay in San Francisco. However, the city has not been giving Twitter enough slack and the company is tightening the screw by being public about potential plans to move.

It's important for cities and municipalities to make a concerted effort to keep businesses in town, but is Twitter just rocking the boat in a public way to force the city into cutting its taxes? How far should the City of San Francisco go to make keep Twitter in town?  Let's debate (respectfully) in the comments below.