A keyword search on the Influencer Stream pulls in contacts that have mentioned that word within their context. You may also want to search a specific hashtag to bring in all the mentions of it via twitter. To use a keyword search you will first want to choose "keyword" from the drop down in the top left of the stream.
Simply type the keyword within the text box. You are able to type more than one word if necessary. You will see the option to search by keyword once you have entered the text.
The Influencer Stream will pull in content that has mentioned the keyword. It will be highlighted in yellow within the stream.
You are now able to scroll through the content to see the different mentions. The Stream will be updated if new mentions do come in. Any new mentions that do come in will appear at the top of the stream.