Tagboard allows the aggregation of Facebook, Twitter, Instagram, Google+, Vine and Flickr posts featuring a specified Hashtag. The aggregated contents are displayed in a nice layout, and with all your accounts connected you can view, like, comment etc within Tagboard itself, and set Featured posts.
Tagboard doesn’t pick up everything that well. Some of this is due to Facebook changing their policies, and some is due to only picking up posts if the hashtag is present on the original posting. If a hashtag is added subsequently, it does not appear.