The Secret Service is purchasing software to watch users of social networks in real time, according to contract documents.

In a work order posted on Monday, the agency details information the tool will collect — ranging from emotions of Internet users to old Twitter messages.

Its capabilities will include “sentiment analysis,” “influencer identification,” “access to historical Twitter data,” “ability to detect sarcasm,” and “heat maps” or graphics showing user trends by color intensity, agency officials said.

The automated technology will “synthesize large sets of social media data” and “identify statistical pattern analysis” among other objectives, officials said.

The tool also will have the “functionality to send notifications to users,” they said.