Most users often link their Instagram account to their Twitter and Facebook accounts, so you need to be wary. You can getaway with using more hashtags on Instagram than other platforms, but you don't these getting published onto your Twitter and Facebook. Why?
THE LOWDOWN ON HASHTAGS
Excessive hashtagging is an annoyance on Twitter, and can looks like spam when overused. The hashtag on Facebook is relatively new, but again clutters the content. The other important factor with Twitter is that hashtags perhaps dilute the effect of the clickable link. You want your users to hit the link, and it will be lost if you bury it in a sea of hashtags. This isn't problem on Instagram, because there are no links, the focal point is only the picture.
HOW TO MAKE INSTAGRAM POSTS SOCIAL MEDIA FRIENDLY
To avoid cluttering your other Social Media feeds, publish your Instagram post before adding hashtags, or adding only one or two (of you wish to add a hashtag to your tweet). This keeps all platforms cleaner. You can add more hashtags to your Instagram post afterwards, by commented under the picture, without these showing elsewhere. You can see an example of this to the right. Happy Gramming!