Greplin enables you to perform lightning fast search across all your online data in one place. The process is very simple. You need to sign up with your valid email address to access this service. Then on the homepage start building indexes by click the available items (screenshot above). The starred items are not available for free account. After building indexes you can start search. Greplin acts just like Google Instant and it is amazingly fast.
There are three types of Greplin account available now. Free, premium and Premium Plus. You can compare Greplin Free, Premium and Premium Plus account here.
Also note that when you allow third party websites to access your Twitter, Google or any other account you should know what information the particular account share with the third party web site. See Google’s privacy concerns here. Check others also.