Social network services are increasingly being used in legal and criminal investigations. Information posted on sites such as Twitter, Instagram, and Facebook has been used by police and university officials to prosecute users of said sites. In some situations, content posted on Myspace has been used in court to determine an appropriate sentence based on a defendant's attitude. Social media can be used as an investigative tool to obtain probable cause for a search warrant. Agencies can surveil social media sites via software programs, such as X1 Social Discovery, MediaSonar, and Geofeedia.