CURRENTBLEND combines the feeds from various social networks (think: Facebook, Twitter, Tumblr, Instagram, and more) into one, handy-ashell, easy-to-use website.
Please try it.
Step 1 -- Connect Facebook
Step 2 -- connect to other networks -- look to the upper-left. If you don't use others, it's ok, but you should try them!
Step 3 -- Come back, use the icons to comment, share, reply like you would with any of the social networks, it's simple.