**1. Instagram**

The ideal length for picture captions is up to 125 characters.

As for hashtags? While the platform allows 30 hashtags per post, 11 seems to be the magic number to optimise engagement.

![hashtags on instgram](https://s3.amazonaws.com/cooalaLIVE/hotstuff/79029_TEASER_5_medium.jpg)

**2. Youtube**

[SumAll](http://blog.sumall.com/) and [Buffer](https://buffer.com/) analyzed the top 50 YouTube videos and found that the average length was [2 minutes and 54](http://www.socialmediatoday.com/marketing/carianneking/2015-07-07/what-ideal-length-everything-online-infographic) seconds.

![youtube videos](https://s3.amazonaws.com/cooalaLIVE/hotstuff/79029_TEASER_1_medium.png)

But [Wistia](https://wistia.com/blog/optimal-video-length) reported that engagement is steady up to **2 minutes**.
For a video of 4-5 minutes, fewer than 60% of your viewers will still be with you at the end –contrasting strongly with 75% for a 1-2 minute video.

![youtube videos](https://s3.amazonaws.com/cooalaLIVE/hotstuff/79029_TEASER_2_medium.png)

And don’t over-tag! [Google](https://support.google.com/youtube/answer/6390658) will ignore all video hashtags when it has more than 15!

*Graphic Sources: Source1: Photo by NeONBRAND on Unsplash // Source2: [Buffer Social](https://blog.bufferapp.com/a-scientific-guide-to-hashtags-which-ones-work-when-and-how-many) // Source3: [Socialbakes]() retrieved from [Track Maven](https://d25qe19fo1nsn4.cloudfront.net/wp-content/uploads/2015/07/YouTube-Video-Views.png) //