Training Videos > Social Media Introduction SeriesLinkedInLinkedIn is a business-oriented social networking service. Founded in December 2002 and launched on May 5, 2003, it is mainly used for professional networking. Facebook Twitter Instagram Pinterest LinkedIn Periscope Hash Tags SharePinTweetEmail+1Share Related ResourcesDownload Our 2017 Instagram Planner & WorkbookSocial Media Booster Packs (Instagram Quote Images)Join Our Workshop for More Training & ResourcesNeed a Virtual Assistant or Web Developer? Hire TLC!