Microsoft has announced that it will be buying enterprise social network Yammer for $1.2 billion in cash. The social network will be folded into the Office division, where it will continue to be developed as an independent product.

It’s not even a month that Facebook splurged $1 billion on Instagram and Facebook has bought yet another mobile app. Glancee, a location based discovery app has announced that it has been acquired by Facebook.

The Posterous team has promised that all the existing services at Posterous (like Posterous Spaces) will continue to be live and the withdrawal of any service will be announced well in advance.

Though $8 Billion sounds crazy, Skype will offer Microsoft value for cloud collaboration in the next 5 years.

Delicious acquired by YouTube founders Chad Hurley and Steve Chen. Delicous is now part of AVON.

Digsby, the popular multi-protocol IM and social networking client has been acquired by Tagged; a social discovery engine for finding new people.

Twitter might acquire TweetDeck for $50 million. Twitter is in advanced talks to acquire TweetDeck the popular desktop and mobile twitter client.

Google has bought Twitter. Google is paying close to $2.5 billion for Twitter and will monetize the website using Google Ads.

Nokia to sell Qt licensing business to Digia. Nokia says they are still invested in the future of Qt on MeeGo.

YouTube is taking several initiatives to produce and own original content instead of simply being a video hosting site. The latest step towards this goal is the acquisition of web based video production house Next New Network.

Bill Gross holds Twitdroyd, Echofon and UberTwitter and the acquisition of TweetDeck will definitely be a relevant and valuable addition to his company.

Skype has acquired Qik, a mobile video startup for $150 million. Qik has close to 5 million users on various mobile platforms like Android, iPhone, Blackberry, Symbian etc.

Zynga will be acquiring Flock, the social web browser. Zynga may bring an integrated gaming expereince to browsers with Flock.

TechCrunch has released an exclusive report on Google’s acquisition of Plannr. The acquisition has seen no official statement from Google yet and so, the prices have not been confirmed as well.

AOL has officially acquired the popular technology blog, TechCrunch. It is now a part of the AOL Technology Network, which includes Engadget and TUAW.