LinkedIn was the professional social network that reported a stronger fourth quarter in 2011 earnings today. LinkedIn’s revenue for the fourth quarter was $167.7 million, which is an increase of 105% compared to $81.7 million during the fourth quarter in 2010.

LinkedIn Corporation (NYSE:LNKD) founder Reid Hoffman was thoroughly profiled by The New York Times this weekend. The story really gave you an inside behind how LinkedIn grew from a small social network that nobody heard about to a public company minting hundreds of millions of dollars. As a venture capital partner at Greylock, Reid Hoffman is also a go-to guy for business advice in Silicon Valley.

LinkedIn Corporation (NYSE:LNKD) started focusing heavily on their mobile strategy. Today they updated their iPhone, Android, and other mobile web apps. LinkedIn Mobile is growing 400% year-over-year in terms of users.

LinkedIn “pulled a Facebook” recently and used profile photos in ads on the professional social network, and the users got angry. Now the site is recoiling from the backlash and changing the in-house ads program to keep users’ photos out of it. As PC Mag reports, the entire fiasco stems from a privacy policy change LinkedIn made in June, which allowed the company to collect data from users’ profiles and use it in social ads.

Some of the technology companies that have filed to have an IPO this year includes Zillow.com, Zynga, Groupon, and LivingSocial. Given Pandora and LinkedIn’s success on their recent IPO, it provided positivity and excitement for the aforementioned companies to go public. However today’s economy gives the stock market an entirely different perspective.

LinkedIn Corporation (NYSE:LNKD) has reported their second quarter results today. LinkedIn’s revenue for the quarter was at $121 million, which is an increase from $54.9 million in Q2 2010. This is a 120% increase. The net income for the second quarter was $4.5 million compared to $4.3 million for the second quarter of 2010.

A new wave of Google+ stories has arrived! Click through to find the link to the Apple App Store page for the Google+ for iPhone app, the Google+ profiles of Facebook staff, a way to find public Google+ hangouts, LinkedIn CEO Jeff Weiner’s opinion of the new social network and a rumor about verified celebrity accounts.

LinkedIn is now the second-largest social network in the United States, finally surpassing Myspace with nearly 34 million unique visitors. Alongside this success, Roger Lee has created an unofficial addition to LinkedIn called Job Change Notifier. According to TechCrunch, the service uses LinkedIn’s API to let you know when any of your LinkedIn contacts update their jobs on the site.