A tweet disseminated earlier today by Telegram blamed Instagram's owner Facebook for taking what it obviously feels is a hypocritical action. Pavel Durov, the messaging app's founder, pointed out that links to LinkedIn, Twitter, Facebook, VK and Periscope still work. Durov noted that this isn't the first time that links to Telegram have been blocked by a Facebook owned property. "Like in [the] case with WhatsApp blocking links to Telegram, we received no clarification or warning from Facebook/Instagram."
Telegram has been growing rapidly and also offers an in-app photo editing feature. At the time that Telegram announced this capability, it was sharing 35 million pictures a day compared to Instagram's 70 million. Regardless of whether that gap has since increased, dropped, or stayed the same, it seems that Instagram does feel threatened.
Instagram blocks deeplinks to Telegram and Snapchat
source: @telegram via TechCrunch