This week I've put together an info graphic featuring the Google/Yahoo! rivalry (which is now over 10 years old) in terms of most expensive acquisitions.  

Yahoo! Inc. was incorporated in 1994 and like Google, it started as an internet search engine but soon grew into a multi-faceted Web portal. It began acquiring other companies in 1999 in order to expand the range of its services.

Google was founded in 1998 and since 2003 it has acquired its own series of companies in order to provide users with email, voicemail and mapping services, among other things.

Here is a time line of the most expensive acquisitions for both companies from 1998 to 2008.