Instagram Live is a feature on Instagram Stories that allows users to stream video to followers and engage with them in real time. It will definitely benefit in increasing some real Engagement.
The major difference between Instagram personal and Business Account is that in Business Account , You get access to additional features like Audience Analytics , Access to Ads Platform.
Instagram was first introduced in October 2010 , Facebook purchased the Instagram app for $1 billion in April 2012 .Following the purchase the number of monthly users went up to 80 million and by the start of 2014 there were almost 150 million Instagram monthly users. Now, Instagram boasts 800 million monthly active users and 500 million active daily users
IGTV - full form is Instagram TV , Other Video Uploading options are also available on Instagram , but were limited to a maximum of 30-seconds. Now, IGTV allows users to upload videos up to an hour in length.
You can use upto 30 Hashtags on an Instagram post.