I recently started using a new search utility called Greplin. Greplin, co-founded by 20 year old Israeli Daniel Gross, lets users enter credentials to their Gmail, Facebook, Twitter, Tumblr, LinkedIn, etc accounts and then builds a custom search engine that will search through content in each allowed application.
Most of us have got information coming at us from multiple sources (email, Facebook, Twitter, etc) and it's often difficult to remember where an important piece of information came from and is located. That's exactly what happened to Goss a few years ago - he was on his way to a party and was trying to find the address. He could not remember what app the invitation came in on and spent a while flipping through different apps on his smartphone before he found it. Instead of just complaining about it, Goss decided it was time to build a search engine that could be customized to search individual user content across apps.
Greplin has a “freemium” or free service along with an enhanced version that will search business apps like Salesforce for $5 per month or $50 per year. There are smartphone versions and a very nice plugin for the Chrome browser. Check it out.