Social media & Lying & Popularity

I don't even know where to begin with this. My 15 year old son has bought the social services, safeguarding teams and the police to my doors over last few weeks. He has been posting lies on his snapchat and tik tok accounts. Saying me and his dad have gone on a cruise and he's been left alone for his birthday. Turning up at a town and singing outside with crowds of kids mocking him. He loves singing but why he had to do it. We tried to disuade him but we were told we were unsupportive. This got reported to his school by a concerned passer by and to the police as well. I've had police knocking my door at 3am in the morning saying my sons rung someone threatening to take an overdose and him saying he is non the wiser. Checking his phone I couldn't see any calls.   Trying to arrange his 15th birthday and allowing him 2 friends to take out. He wanted a party with 25 people then he posted on snapchat he'd been left alone for his birthday whilst his parents were on a cruise, all obviously utter lies and now the 2 people that were coming are refusing to come as they know he's lied and he's been desperately trying to arrange something bigger and better and I just don't understand. He said last year he was on his own with his cake that's rubbish as well and his friend knows as he was there with him. I make an effort every year to make his day special and he's portrayed me on snapchat as a parent that doesn't care. I have tried to tell him he can't post things on snapchat that aren't true and that isn't his to share but he just doesn't get it. I've already taken tiktok off him I don't want to take his way of communicating with friends away altogether but I can't keep having people at my door due to his lack of understanding of social media. Any help or suggestions greatly appreciated I'm at the end of my teather I'm wondering if he has low self esteem buy I don't know what to do. I've offered counselling and he doesn't want to talk to anyone.