This includes linked third-party service data (information we get when you link your Snapchat account to another service), data from advertisers (information from advertisers, app developers, publishers, and other third parties to help target or measure the performance of ads), contact info from other Snapchatters or third parties (if another Snapchatter uploads their contact list which includes your information, we may combine that with other information we have about you to better understand who you may want to communicate with.