I was surfing a website called Product Hunt (which, if I must admit is rather addictive!) and I stumbled upon this cool new application called Hashtag Key. Once installed onto your phone, and then added to your keyboard you can instantly add hashtags to any of your content by the tap of a button.
If adding relevant hashtags to your social media accounts is part of your marketing strategy (and it should be!), then this app is for you. It would be fantastic if they created a desktop version, but I can't see that happening anytime soon!