This tool is definitely unique, but it's awfully expensive for what it offers.

Basically, it's a social media post widget you can embed anywhere. There are lots of these offered, and a lot of them are too expensive, but not THIS expensive.

The added benefit that Walls.io gives you is IN-PERSON social embeds. You put a screen up for interactive walls at conference or event booths, for example, and it pulls in any post with the event's hashtag.

You can also use Walls on ad placements on street-level billboards for example, which is unique.

But all of these offerings are something I could hack together with much cheaper tools, and while Walls.io was solid in terms of usability and functionality, I just think if you're a solo builder like myself you can find much better and cheaper forms of social proof, whether in-person or online.