A few months ago, Adobe released a new and free mobile app called Adobe Post. Simply put, Adobe Post is a fun and fast way for anyone (and I mean anyone) to create stunning social graphics. You pick a photo, add text, and apply some design filters to instantly create beautiful designs.
So if you're into creating memes, or just want to add a dab of text to your Instagram and Twitter photos, Post is a great option.
For example, when I post images to Instagram, I typically including some witty (I hope) comment to tag the image. With Post, I can add that bit of text - decoratively - to the image itself.