I love being able to pull in logos for merchants from Twitter as it makes the transaction feed so easy to parse.
However there are some merchants that are not on Twitter. It would be awesome to use other source like Instagram or Facebook. One example is this restaurant Outer Orbit (https://www.instagram.com/outerorbitsf).
Perhaps an easy way to do this in the UI could be to add a segmented control or picker component to let someone indicate the source.