Yes, they also matter. I'd better put it another way: they not only matter, but they also play an extremely important role in making your posts reach your potential audience. Just choose the hashtags that are popular among your possible audience as namely tags will help them to see your posts. Don't limit their number to only 1 or 2. Increase your chances to be seen! If you don't know what hashtags will be suitable for you, use our BB free hashtag generator
By the way, geotags can also help you. Don't ignore this feature.