The trick is knowing when to use hashtags, how many and what your hashtags should be.
Photos with 11 or more get the most engagement, and there is a max number of Photos with 11 or more get the most engagement, and there is a max number of hashtags that can be used, its 30! Whoa! That is a lot of hashtags so go to town and have fun with hashtags to target your audience. Use them and use them well. If you add then hashtags in the comments with will still appear in search results but they will not be adding to the site lines of the photo.
Twitter recommends keeping it to 2. This all depends on your audience. You have a limited number of characters you can use and you still need to get your message across. Run a test on your own twitter for the number of hostages you are using and track you results. You will learn what ones get the most response from the audience you are creating.
Remember that you can not search hashtags on Facebook only click and see other posts with the same hashtags. Use the hashtag as part of the sentence to post where you are or what you are doing. Keep to 2 posts when using a hashtag so you are not appearing to spam.
2-4 hashtags is the best practice and placement at the bottom of the post where they are less intrusive.
When to not use hashtags
Pinterest. Pinterest uses a search tool that follows the results based on the cat orgies and comments that have been made on posts. If you still want on using them in Pinterest keep it in mind that they are not searchable and can only be used in the pin description.
LINKEDIN – Don’t bother. LinkedIn did away with the Hashtag in 2013. This has been replaced with “tags” similar in a way you would with a blog post on tumbler or WordPress using up to 3 keywords.