Startup Idea : stalking app

i saw many people who wait for many hours and hours just staring at the social media app expecting a reply for their message. or sometimes the respondent forgets the request due to many reasons this is just a waste of precious time. there are many instances in life where we cannot pressurise them to give a response the only thing is we should wait. it happens between a customer and a sales person between friends and peer groups between lovers .... the solution for this issue is i would like to create an app which can keep a track on the specified people on social media when ever the required person is online or active, the app should send a notification that this person is active and you can live chat. this is very helpful for many people.