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Today, the major search engines use many metrics to determine the value of external links. Some of these metrics include: The trustworthiness of the linking domain.
What are the metrics used by the major search engines to determine the value of External Links?
Social networking service
The 10 Social Media Metrics Your Company Should Monitor
Tracking Social Media Effectiveness | Social Media Defined
Are you measuring the right social media metrics?
Measuring Social Media Effectiveness & Engagement: On Your Own | WSI Social Media Strategies
When a Twitter user sees a post they want to share with others they retweet it. Retweeting, known as "RT" in Twittering circles, is the act of reposting someone else's Twitter update.
Measure Twitter effectiveness by tracking retweets
How to Measure Twitter Marketing Effectiveness
As more and more companies decide that investing in a Twitter account is appropriate for their marketing campaign, one thing that traditionally gets lost in the discussion is how they will measure success. A Twitter account, just like any form of marketing, requires a set of concrete goals that you hope to achieve through marketing in that channel. Are you looking to cut down on customer support calls? Looking to spread brand awareness or “thought leadership”? If you want to learn from what you’re doing, and find ways to become more successful on Twitter you’ll need to define a set of KPI’s.Carolyn Everson, Facebook's vice-president of global marketing solutions, unveiled the new initiatives at New York's Advertising Week, throwing light on to how the company intends to monetise the new products it unveiled at its own f8 conference last month.
Facebook to allow companies to measure effectiveness of their pages
How To Profit With Social Network Websites – Popular And Makes Money… « Talking Odours
Were you aware that you can profit with social network websites? These sites are incredibly popular and are a great tool for any online or offline business.The Three Key Ways LinkedIn Makes Money
LinkedIn ( LNKD ) is a business-oriented social networking site where professionals can connect with each other to explore job and career opportunities. The company makes money primarily in three ways: Selling recruitment services to employers Selling premium advertising, and Selling premium subscriptions to employers and users.Facebook Had $1 Billion In Profits Last Year, On $3.7 Billion In Revenues
Facebook just filed its IPO registration ( SEC doc here ) and its financials are off the charts.They say its free.

