Learn how to translate Hindi to English online for free using Google Translation. The same translation tool will also help you convert English documents and web pages into Hindi and other Indic language as well.
Facebook Lexicon is like Google Trends - it lets you compare how frequently some particular words and phrases are written on Facebook over time. It uses stuff posted on Facebook Walls, events and profiles.
FriendFeed is mostly used for tracking the online activities of our friends at one place - the blogs they are writing, the photos they upload to Flickr, the books they review at Amazon, the web pages they save onto delicious, and so on.