Photos should be annotated for two reasons:
1) Photos should span through months and years to show how life together evolved. If there are no dates in caption, how can one tell when where they taken? Maybe they were taken few days apart, which is not good enough evidence.
2) Photos should have captions of people on them. Photos of just two of you are worthless. Photos with family and friends can contain 3-10 people in each of them. Person reviewing the case may have never seen you or your spouse. If they cannot tell who's on photos and what's the relationship - those photos are worthless.
Summary: photos are the least important evidence. But if you do send them, make sure to include photos spanning months and years, only send photos including other people, and make sure to annotate them. Photos without descriptions are of no value.
Done that for my AOS, ROC as advised by lawyer. Both approved promptly without RFEs
P.S. I wouldn't personally send social media stuff. Some couples may benefit, but the gain is small.