Shieldy — is the best solution in Telegram to fight annoying spammers. It asks newcomers to execute a set action within a set period, otherwise it kicks them. That's all. Also it's completely free and open source.
FakesBlocker helps your easily and efficiently block impersonators on Twitter to avoid being misled. Influencers in different spheres on social media usually have impersonators trying to feed off their popularity/trustworthiness to scam or misinform you and me. Stay ahead of this evil by blocking them before they have the chance to strike!