major Acquisitions of Internet / Online / Technology companies in the corporate world till-date

Linkedin

Jun 2016 - acquired by Microsoft for $26B

Linkedin is a business/employment oriented social networking service. As of 2016, it had more than 467M users in over 200 countries and territories.

Skype

Sep 2005 - acquired by eBay $2.6B

May 2011 - acquired by Microsoft for $8.5B

Skype is an application that provides video chat and voice call services. Users may exchange such digital documents as images, text, video and any others, and may transmit both text and video messages. Skype allows the creation of video conference calls. Skype is based on a freemium model. Much of the service is free, but Skype Credit or a subscription is required to call a landline or a mobile phone number. At the end of 2010, there were over 660M users, and 300M MAU (monthly active users) in 2016.

Yammer

Jun 2012 - acquired by Microsoft for $1.2B

Yammer is a freemium enterprise social networking service used for private communication within organizations. Access to a Yammer network is determined by a user's Internet domain so that only individuals with approved email addresses may join their respective networks. Just before acquisition it had reached 8M user-base.

WhatsApp

Feb 2014 - acquired by Facebook for $19B

WhatsApp Messenger is a free, cross-platform, end-to-end encrypted instant messaging, proprietary and social media application for smartphones. It uses the Internet to make voice calls, one to one video calls; send text messages, documents, PDF files, images, GIF, videos, user location, audio files, phone contacts and voice notes to other users using standard cellular mobile numbers. By Feb 2016, WhatsApp had a user base of over 1B making it the most popular messaging application at the time.

Instagram

Apr 2012 - acquired by Facebook for $1B

Instagram is a mobile photo-sharing application and service that allows users to share pictures and videos either publicly or privately on the service, as well as through a variety of other social networking platforms, such as Facebook, Twitter, Tumblr, and Flickr. Instagram was launched in Oct 2010 as a free mobile app, exclusively for the iOS mobile platform via the Apple App Store, but was later released for Android devices in Apr 2012. The service rapidly gained popularity, with over 100M MAU (monthly active users) as of Apr 2012 and over 300M MAU as of Dec 2014. It was acquired by Facebook in Apr 2012 for ~$1B. In 2013, Instagram grew by 23%, while Facebook, as the parent company, only grew by 3%.

Yahoo!

Jul 2016 - acquired by Verizon for $4.8B

In Jan 2000, at the height of the dot-com boom, Yahoo! was valued at $125B. During it's downfall, in Feb 2008 Microsoft made an bid to acquire Yahoo for $44.6B which Yahoo! declined.

Yahoo! valuation timeline

Motorola Mobility

Aug 2011 - acquired by Google (Alphabet) for $12.5B
This was the biggest acquisition by Google after DoubleClick (an online advertising platform acquired in Apr 2007 for $3B) & Youtube (an video sharing paltform acquired in Oct 2006 for $1.6B)

Oct 2014 - acquired by Lenovo for $2.9B

Motorola Inc. was an American multinational telecommunications company. After having lost $4.3 billion from 2007 to 2009, the company was divided into two independent public companies, Motorola Mobility and Motorola Solutions on January 4, 2011. Motorola Solutions is generally considered to be the direct successor to Motorola, Inc., as the reorganization was structured with Motorola Mobility being spun off. Unlike most other acquisitions, this was about Google acquiring patents (which the search giant retained after the sale to Lenovo) to defend itself against Apple rather than have an integrated hardware maker.

Source:

computerdealernews.com/slideshows/updated-top-10-biggest-tech-acquisitions-of-all-time
visualcapitalist.com
en.wikipedia.org/wiki/List_of_mergers_and_acquisitions_by_Alphabet
en.wikipedia.org/wiki/List_of_mergers_and_acquisitions_by_Facebook
en.wikipedia.org/wiki/List_of_mergers_and_acquisitions_by_Microsoft